S173: T-CELL ACTIVATION AND MYELOMA CELL KILLING CONFIRM THE MODE OF ACTION OF RG6234, A NOVEL GPRC5D T-CELL ENGAGING BISPECIFIC ANTIBODY, IN PATIENTS WITH RELAPSED/REFRACTORY MULTIPLE MYELOMA - I. Dekhtiarenko; I. Lelios; J. Attig; N. Sleiman; D. Lazzaro; I. Clausen; N. Gräfe; H.-J. Helms; E. Schindler; S. Belli; T. Fauti; J. Eckmann; et al. (HemaSphere, 2022)