X0206 3 2020-11-02 1 0001690585 Magenta Therapeutics, Inc. MGTA 0001741389 Mahoney Stephen F. C/O MAGENTA THERAPEUTICS, INC. 100 TECHNOLOGY SQUARE CAMBRIDGE MA 02139 0 1 0 0 See Remarks Chief Financial and Operating Officer Exhibit 24.1: Power of Attorney /s/ Zoran Zdraveski, Attorney-in-Fact for Stephen F. Mahoney 2020-11-04