Phenotypic analysis of Vδ1 and Vδ2 T cells in uninfected and chronically SIV-infected RMs. (A) Vδ1/Vδ2 ratio in the peripheral blood (red), spleen (yellow), peripheral lymph nodes (blue; axillary or inguinal), mesenteric lymph nodes (green), small intestine (pink; duodenum, jejunum, or ileum), large intestine (black; cecum or colon), and BAL (orange) of uninfected (squares) and chronically SIV-infected (circles) RMs. (B) Percentage of Vδ1 T cells expressing CD28 and CCR5. (C) Percentage of Vδ2 T cells expressing CD28 and CCR5. P values were calculated using the Mann-Whitney U test.