Exhibit 31.3
CERTIFICATIONS
I, William Ho, certify that:
| 1. |   I have reviewed this Amendment No. 1 to Annual Report on Form 10-K of IN8bio, Inc.;  | 
| 2. |   Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;  | 
Date: May 7, 2025
| By: |   /s/ William Ho  | |
| William Ho | ||
|   Chief Executive Officer (Principal Executive Officer)  |