Fig. 2From: All-trans retinoic acid alleviates transmissible gastroenteritis virus-induced intestinal inflammation and barrier dysfunction in weaned pigletsEffect of ATRA on serum DAO activity of piglets challenged with TGEV. The activity of diamine oxidase (DAO) in serum of piglets was detected by ELISA. Data are presented as mean ± SE. a,bValues in the same row with different superscripts letters are significantly different (P < 0.05)Back to article page