P1613: SINGLE-CELL ANALYSIS FOLLOWING SARS-COV-2 MRNA VACCINE IN ALLOGENEIC HEMATOPOIETIC STEM CELL TRANSPLANTATION RECIPIENTS. (23rd June 2022) - Tranter, E.; Obermayer-Wasserscheid, B.; Hütter-Krönke, M.-L.; Junkuhn, C.; Blau, I.-W.; Vuong, G. L.; Bullinger, L.; Na, I.-K.