PB2175: TRYPAN BLUE AND FLOW CYTOMETRY CELL VIABILITY TESTING OF PACKED OR DILUTED CRYOPRESERVED AT -80ºC HEMATOPOIETIC STEM CELLS SHOW SIMILAR RESULTS. (23rd June 2022) - Tonev, I.; Simeonov, S.; Ilieva, M.; Muhtarova, M.; Vladimirova, R.; Andreinski, N.; Yancheva, T.; Guenova, M.; MIncheff, M.