Figure 3.

The pairwise variation (Vn/n+1) of the nine candidate reference genes under various test conditions calculated by geNorm software, and the number of optimal reference genes was determined by a threshold of 0.15.

The pairwise variation (Vn/n+1) of the nine candidate reference genes under various test conditions calculated by geNorm software, and the number of optimal reference genes was determined by a threshold of 0.15.