Distribution of macaque NK-cell subsets in blood and tissues. (A) Representative flow cytometric plots showing distribution of NK subsets based on CD56 and CD16 expression in PBMCs and lymph node (LN), vaginal, and rectal biopsies (Bx) of uninfected rhesus macaques. (B) Frequencies of each of the NK-cell subsets are shown as a fraction of the total NK-cell population as defined in Figure 1. Horizontal bars represent medians of 9-15 animals.