Figure 2

Cytotoxic granule content of immature CD56+ cells: A. Absence of perforin and granzyme B in CD34+ cells incubated with IL-2 and SCF for up to 15 days compared with control (representative of three experiments). B CD56+ cells from three week cultures showing presence of granzyme A but not perforin compared with control IL-2 stimulated PBL.