Fig. 4. Flow cytometric analysis of feline and human CD9 expression on murine fibroblasts. 3T3s transfected with feline CD4 (4a, b, c), CD9 (4d, e, f) and human CD9 (4g, h, i) were stained with anti-feline CD4 (vpg33; 4a, d, g), anti-feline CD9 (vpgl5; b, e and h) and anti-human CD9 (FMC56; 4c, f, i). Percent positive was calculated from the analysis gate shown.