Fig. 4. Effects of PAMK on T cell activation-related genes in CTX-treated geese. (a) Relative mRNA expression of CD28. (b) Relative mRNA expression of CD96. (c) Relative mRNA expression of MHC-II. (d) Effects of PAMK on the IL-2 content of CTX-treated geese. Means with the different letters represent statistically significant values (P < 0.05); the bars with a common letter are not significantly different (P > 0.05).