KLRC1 and infection: When R(act/inh) was plotted vs survival (Additional file 1: Figure S1), values were comprised within a narrow range in 10/12 patients, showing that the NKG2 activation/inhibition balance is similar in spite of a considerable heterogeneity in underlying malignancies, conditioning regimens, engraftment kinetics, infection/clinical course, and allo/auto transplantation settings.