Heat map and correlation analysis of apoptosis−related parameters (A,B) and protein levels of p38MAPK and JNK (C,D) in the skin of on−growing grass carp (Ctenopharyngodon idella) administered vitamin D after infection with A. hydrophila. Caspase, cysteinyl aspartate specific proteinase; FasL, Fas ligand; APaf1, apoptotic protease activating factor−1; Bcl−2, B−cell lymphoma−2; BAX, Bcl-2 associated X; Mcl−1, myeloid cell leukemia−1; IAP, inhibitor of apoptosis protein; p38MAPK, mitogen−activated protein kinases; JNK, c-Jun N−terminal kinase; N = 6 for gene expression and N = 3 for Western blotting analysis; different letters above bars indicate significant differences (p < 0.05); red indicates upregulation; blue indicates downregulation; * presents p < 0.05, ** presents p < 0.01.