Table 1.

Ct values of five candidate reference genes

Reference	Mean ± SD	CV, %
U6	22.854 ± 0.045	0.1967
18S	23.127 ± 0.077	0.3346
GAPDH	28.331 ± 0.067	0.2355
ACTB	26.956 ± 0.185	0.6865
TUB	28.186 ± 0.110	0.3919

ACTB, β-actin; GAPDH, glyceraldehyde-3-phosphate dehydrogenase; TUB, tubulin; SD, standard deviation