Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the use of our report dated March 23, 2023, with respect to the consolidated financial statements of TCR² Therapeutics Inc., incorporated herein by reference, and to the reference to our firm under the heading “Experts” in the prospectus.

/s/ KPMG LLP

Boston, Massachusetts

April 18, 2023