P605: IMMUNOGENETICS AND ANTIGEN REACTIVITY PROFILING CONTRIBUTE TO UNRAVELLING THE ONTOGENY OF CLL STEREOTYPED SUBSET #4 - Anastasia Iatrou; Electra Sofou; Eleni Kotroni; Lesley Ann Sutton; Michela Frenquelli; Raphael Sandaltzopoulos; Ioanna Sakellari; Niki Stavrogianni; Fotis Psomopoulos; Paolo Ghia; Richard Rosenquist; Andreas Agathangelidis; et al. (HemaSphere, 2023)