KYTX

Represents the number of shares withheld by and surrendered to the Issuer on May 27, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of a restricted stock unit award for 16,634 shares that vested in full on May 27, 2026.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 27, 2027, and (ii) immediately prior to the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/4th of the shares subject to the option shall vest on May 18, 2027, and 1/48th of the shares subject to the option shall vest following each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/4th of the shares subject to the option shall vest on May 4, 2027, and 1/48th of the shares subject to the option shall vest following each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive

1/4th of the shares subject to the option shall vest on March 13, 2027 and an additional 1/48th of the shares subject to the option shall vest on the same day of each month thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/4th of the shares subject to the option shall vest on March 13, 2027 and an additional 1/48th of the shares subject to the option shall vest on the same day of each month thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock and 1/4th of the shares underlying the restricted stock unit award shall vest on March 13, 2027 and an additional 1/4th of the shares underlying the restricted stock unit award shall vest on each one-year anniversary thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock and 1/4th of the shares underlying the restricted stock unit award shall vest on March 13, 2027 and an additional 1/4th of the shares underlying the restricted stock unit award shall vest on each one-year anniversary thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock and 1/4th of the shares underlying the restricted stock unit award shall vest on March 13, 2027 and an additional 1/4th of the shares underlying the restricted stock unit award shall vest on each one-year anniversary thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/4th of the shares subject to the option shall vest on March 13, 2027 and an additional 1/48th of the shares subject to the option shall vest on the same day of each month thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/36th of the shares subject to the option shall vest on each monthly anniversary of the date of grant, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock and 1/3rd of the shares underlying the restricted stock unit award shall vest on each one-year anniversary of the date of grant, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/36th of the shares subject to the option shall vest on each monthly anniversary of the date of grant, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock and 1/3rd of the shares underlying the restricted stock unit award shall vest on each one-year anniversary of the date of grant, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

1/4th of the shares subject to the option shall vest on February 9, 2027, and 1/48th of the shares subject to the option shall vest following each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive

Represents a restricted stock unit award of common stock, 1/4th of the shares subject to which shall vest on January 12, 2027, and 1/4th of the shares subject to the restricted stock unit award shall vest following each one-year period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a performance restricted stock unit award of common stock, which will vest upon the Issuer's common stock achieving certain specified prices per share.

1/4th of the shares subject to the option shall vest on January 12, 2027, and 1/48th of the shares subject to the option shall vest following each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. ("Westlake Opportunity"). The general partner of Westlake Opportunity is Westlake BioPartners Opportunity GP I, LLC ("Westlake Opportunity GP I"). The Reporting Person is the managing director of Westlake Opportunity GP I and has sole voting and dispositive control over Westlake Opportunity GP I, and disclaims beneficial ownership of the shares held by Westlake Opportunity except to the extent of the Reporting Person's pecuniary interest therein, if any.

Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. ("Westlake Opportunity"). The general partner of Westlake Opportunity is Westlake BioPartners Opportunity GP I, LLC ("Westlake Opportunity GP I"). The voting and dispositive control over Westlake Opportunity GP I is held by the managing director of Westlake Opportunity GP I, Beth Seidenberg, and whom disclaims beneficial ownership of the shares held by Westlake Opportunity except to the extent of such person's pecuniary interest therein, if any. Sean Harper, a Reporting Person on Westlake Opportunity's prior Section 16 filings with respect to the Issuer, is no longer a managing director of Westlake Opportunity GP I, and accordingly, is not a Reporting Person on this Form 4.

The transactions reported in this Form 4 were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 12, 2025 in effect at the time of such transactions.

The transactions reported in this Form 4 were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 12, 2025 in effect at the time of such transactions.

The transactions reported in this Form 4 were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 12, 2025 in effect at the time of such transactions.

25% of the original number of shares subject to the option vested on January 1, 2025, and 1/48th of the original number of shares subject to the option vests in monthly installments thereafter, subject to the Reporting Person's continuous service.

1/4th of the shares subject to the option shall vest on June 30, 2026, and 1/48th of the shares subject to the option shall vest following each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

All of the shares subject to the option shall be fully vested and exercisable on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, which will vest in full on the earlier of (i) May 29, 2026, and (ii) immediately prior to the date of the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Represents a restricted stock unit award of common stock, 1/4th of which shall vest on April 11, 2026, and 1/4th of which shall vest on each one-year anniversary thereafter, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.