Table I.

Primer sequences for reverse transcription-polymerase chain reaction.

Gene	Upstream primer	Downstream primer
Hes1	5′-TTGGAGGCTTCCAGGTGGTA-3′	5′-GGCCCCGTTGGGAATG-3′
Hey1	5′-CGAGGTGGAGAAGGAGAGTG-3′	5′-CTGGGTACCAGCCTTCTCAG-3′
GAPDH	5′-TCTCATCACCATCTTCCA-3′	5′-CATCACGCCACAGTTTCC-3′

Hes1, hairy enhancer of split 1; Hey1, Hes related family BHLH transcription factor with YRPW motif 1.