The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

 Name of Reporting Persons

 Versant Venture Capital VI, L.P.

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 WC

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 1,457,937 shares of common stock (2)

 Shared Voting Power

 0

 Sole Dispositive Power

 1,457,937 shares of common stock (2)

 Shared Dispositive Power

 0

 Aggregate Amount Beneficially Owned by Each Reporting Person

 1,457,937 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.9% (3)

 Type of Reporting Person (See Instructions)

 PN

This Schedule 13D is filed by Versant Venture Capital VI, L.P. (“Versant VI”), Versant Ventures VI GP, L.P. (“Versant Ventures VI GP”), Versant Ventures VI GP-GP, LLC (“Versant Ventures VI GP-GP”), Versant Vantage I, L.P. (“Versant Vantage I”), Versant Vantage I GP, L.P. (“Versant Vantage I GP”) and Versant Vantage I GP-GP, LLC (“Versant Vantage I GP-GP” and, with Versant VI, Versant Ventures VI GP, Versant Ventures VI GP-GP, Versant Vantage I and Versant Vantage I GP, collectively, the “Reporting Persons”). Versant Ventures VI GP-GP is the general partner of Versant Ventures VI GP, which is the general partner of Versant VI. Each of Versant Ventures VI GP-GP and Versant Ventures VI GP share voting and dispositive power over the shares held by Versant VI. Versant Vantage I GP-GP is the general partner of Versant Vantage I GP, which is the general partner of Versant Vantage I. Each of Versant Vantage I GP-GP and Versant Vantage I GP share voting and dispositive power over the shares held by Versant Vantage I. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant VI. Versant Ventures VI GP-GP is the general partner of Versant Ventures VI GP, which is the general partner of Versant VI. Each of Versant Ventures VI GP-GP and Versant Ventures VI GP may be deemed to share voting and dispositive power with respect to the shares held by Versant VI.

Based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Issuer’s quarterly report on Form 10-Q for the quarter ended September 30, 2023, filed with the United States Securities and Exchange Commission (the “Commission”) on November 2, 2023 (the “Form 10-Q”), of which 71,839,510 of such shares are comprised of voting common stock and 3,092,338 of such shares are comprised of non-voting common stock.

 Name of Reporting Persons

 Versant Ventures VI GP, L.P.

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 AF

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 0

 Shared Voting Power

 1,457,937 shares of common stock (2)

 Sole Dispositive Power

 0

 Shared Dispositive Power

 1,457,937 shares of common stock (2)

 Aggregate Amount Beneficially Owned by Each Reporting Person

 1,457,937 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.9% (3)

 Type of Reporting Person (See Instructions)

 PN

This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant VI. Versant Ventures VI GP-GP is the general partner of Versant Ventures VI GP, which is the general partner of Versant VI. Each of Versant Ventures VI GP-GP and Versant Ventures VI GP may be deemed to share voting and dispositive power with respect to the shares held by Versant VI.

This calculation is based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Form 10-Q.

 Name of Reporting Persons

 Versant Ventures VI GP-GP, LLC

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 AF

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 0

 Shared Voting Power

 1,457,937 shares of common stock (2)

 Sole Dispositive Power

 0

 Shared Dispositive Power

 1,457,937 shares of common stock (2)

 Aggregate Amount Beneficially Owned by Each Reporting Person

 1,457,937 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.9% (3)

 Type of Reporting Person (See Instructions)

 OO

This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant VI. Versant Ventures VI GP-GP is the general partner of Versant Ventures VI GP, which is the general partner of Versant VI. Each of Versant Ventures VI GP-GP and Versant Ventures VI GP may be deemed to share voting and dispositive power with respect to the shares held by Versant VI.

This calculation is based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Form 10-Q.

 Name of Reporting Persons

 Versant Vantage I, L.P.

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 WC

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 862,444 shares of common stock (2)

 Shared Voting Power

 0

 Sole Dispositive Power

 862,444 shares of common stock (2)

 Shared Dispositive Power

 0

 Aggregate Amount Beneficially Owned by Each Reporting Person

 862,444 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.2% (3)

 Type of Reporting Person (See Instructions)

 PN

This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant Vantage I. Versant Vantage I GP-GP is the general partner of Versant Vantage I GP, which is the general partner of Versant Vantage I. Each of Versant Vantage I GP-GP and Versant Vantage I GP may be deemed to share voting and dispositive power with respect to the shares held by Versant Vantage I.

This calculation is based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Form 10-Q.

 Name of Reporting Persons

 Versant Vantage I GP, L.P.

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 AF

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 0

 Shared Voting Power

 862,444 shares of common stock (2)

 Sole Dispositive Power

 0

 Shared Dispositive Power

 862,444 shares of common stock (2)

 Aggregate Amount Beneficially Owned by Each Reporting Person

 862,444 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.2% (3)

 Type of Reporting Person (See Instructions)

 PN

This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant Vantage I. Versant Vantage I GP-GP is the general partner of Versant Vantage I GP, which is the general partner of Versant Vantage I. Each of Versant Vantage I GP-GP and Versant Vantage I GP may be deemed to share voting and dispositive power with respect to the shares held by Versant Vantage I.

This calculation is based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Form 10-Q.

 Name of Reporting Persons

 Versant Vantage I GP-GP, LLC

 Check the Appropriate Box if a Member of a Group (See Instructions)

 (a) ☐  (b) ☒ (1)

 SEC Use Only

 Source of Funds (See Instructions)

 AF

 Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)

 ☐

 Citizenship or Place of Organization

 Delaware

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With

 Sole Voting Power

 0

 Shared Voting Power

 862,444 shares of common stock (2)

 Sole Dispositive Power

 0

 Shared Dispositive Power

 862,444 shares of common stock (2)

 Aggregate Amount Beneficially Owned by Each Reporting Person

 862,444 shares of common stock (2)

 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)

 ☐

 Percent of Class Represented by Amount in Row 11

 1.2% (3)

 Type of Reporting Person (See Instructions)

 OO

This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13D.

These shares are held by Versant Vantage I. Versant Vantage I GP-GP is the general partner of Versant Vantage I GP, which is the general partner of Versant Vantage I. Each of Versant Vantage I GP-GP and Versant Vantage I GP may be deemed to share voting and dispositive power with respect to the shares held by Versant Vantage I.

This calculation is based upon 74,931,848 shares of the Issuer’s common stock outstanding as of October 31, 2023, as reported in the Form 10-Q.