Fig. 3From: 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 CHOP (a) and GRP78 (b) genes in the liver of Shaoxing ducks. Relative expression was normalized to the expression 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,cDifferent 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