Fig. 4From: Effects of cage and floor rearing system on the factors of antioxidant defense and inflammatory injury in laying ducksEffect of cage stress on mRNA expression of COX-2 (a), iNOS (b), IL-1β (c), IL-2 (d), and IL-6 (e) genes in the liver of Shaoxing ducks. Relative expression was normalized to that of β-actin. Vertical bars represent the mean ± S.E. (n = 5). RF ducks = reared on the floor, RC ducks = reared in the cage. a,b,c,d,eDifferent superscripts within columns indicate means are significantly different. The labels 1, 2, 4, 7, and 10 d indicated the days in the cageBack to article page