Table 2. NormFinder microarray expression stability analysis.

Gene Name	Hypoxia Stability Value	Hyperglycemia/Hypoxia Stability Value	Lower log2-Intensity	Upper log2-Intensity
RPLP0	0.008	0.004	13.05	13.31
GAPDH	0.008	0.005	13.81	14.05
RPLP2	0.009	0.005	13.03	13.18
ACTB	0.010	0.005	13.28	13.56
HPRT1	0.015	0.008	9.14	9.77
GUSB	0.016	0.008	8.92	9.65
TFRC	0.018	0.012	10.63	11.40
ATP5F1	0.019	0.010	7.20	7.94
B2M	0.020	0.012	10.44	11.58
RPL13A	0.023	0.028	9.86	11.18

Gene expression in the microarray was calculated by log2-intensity values of the genes. NormFinder transforms log to linear scale and ranks the candidate genes according to their expression stability, where a lower value indicates a higher stability in gene expression. The stability of genes was ranked into two groups, hypoxia for different time points (1, 3, 12 hr) and hyperglycemia/hyperglycemia combined with hypoxia for different time points (1, 3, 12 hr).