Table 3. Summary of reference gene ranking by BestKeeper, NormFinder and GeNorm analysis.

Gene	BestKeeper (SD)	NormFinder (SD)	GeNorm (M value)
gapB	1.46+	1.54	0.82+
glyA	0.53	0.22	0.58
gyrA	0.47*	0.16*	0.44*
pykA	0.91	1.70+	1.03
recA	0.65	0.24	0.44*
recF	0.71	0.47	0.53
rpoD	0.66	0.39	0.61
tpiA	0.74	0.33	0.56

*Indicates the most stably expressed gene/s and + the least stably expressed gene as determined by each program.