Mcs5a modulates γδTCR+ T-cell homeostasis. Percentages of (a) CD4+, (b) CD8+, and (c) γδTCR+ T cells in the splenic CD3+ T-cell population from susceptible congenic control (n = 26), Mcs5a-resistant congenic (n = 26), Mcs5a1 susceptible congenic (n = 20), and Mcs5a2 susceptible congenic (n = 15) rats. The significantly different (P < 0.05) γδTCR+ T-cell population is indicated by an asterisk. Values are expressed as average ± standard error of the mean. Mcs5a, resistant congenic harboring the mammary carcinoma susceptibility locus 5a resistance allele; susc., susceptible congenic control; TCR, T-cell receptor.