TCR phenotype in foamy-treated dogs. (A) Lymphocytes from an unaffected littermate control (R2197) are approximately 79.4% αβ TCR⁺ and 2.3% γδ TCR⁺ at 22 weeks of life. (B) Lymphocytes from X349 at 20 weeks postinjection showed 46.2% αβ TCR⁺ cells and 1.5% γδ TCR⁺ cells. (C) R2202 at 28 weeks postinjection exhibited approximately 16.1% αβ TCR⁺ cells and 49.6% γδ TCR⁺ cells. (D) The presence of peripheral γδ T cells in R2202 (black line) and αβ T cells (gray line) over time.