Table 1. The list of the candidate housekeeping genes with their biological functions.

Gene	Symbol used	Function	Reference
glyceraldehyde 3-phosphate dehydrogenase	GAPDH	glycolytic enzyme	Liang et al. (2014)
tubulin alpha-1 chain	TUB1a	cytoskeletal structural protein	Liang et al. (2014)
elongation factor 1-alpha	EF1a	protein synthesis	Liang et al. (2014)
elongation factor 2	EF2	protein synthesis	Zhu et al. (2014)
ADP-ribosylation factor-like protein 1	ARF1	GTP-binding protein	Shi et al. (2013)
ADP-ribosylation factor 4	ARF4	GTP-binding protein	Shi et al. (2013)
ribosomal protein S8	RPS8	structural constituent of ribosome	Yang et al. (2015)
ribosomal protein L4	RP4	structural constituent of ribosome	Shi et al. (2013)
ribosomal protein L7A	L7A	structural constituent of ribosome	Zhu et al. (2014)
ribosomal protein L10	L10	structural constituent of ribosome	Zhu et al. (2014)
ribosomal protein L18	RP18	structural constituent of ribosome	Shi et al. (2013)