Normal human peripheral blood cells were stimulated with Human IL-2 Recombinant Protein (Product # 14-8029-81) for 15 days, then stained with Anti-Human CD56 (NCAM) FITC (Product # 11-0566-42) and Mouse IgG2b K Isotype Control PE (Product # 12-4732-81) (left) or Anti-Human CD336 (NKp44) APC (right). Viable cells in the lymphocyte gate, as determined by Fixable Viability Dye eFluor® 450 (Product # 65-0863-14), were used for analysis.