Table 1. Primers used for qPCR.

Gene	Forward	Reverse
β-Actin	5’- CTGGAACGGTGAAGGTGACA-3’	5’- AAGGGACTTCCTGTAACAATGCA-3’
E2F1	5’- CATCCCAGGAGGTCACTTCTG-3’	5’- GACAACAGCGGTTCTTGCTC-3’
E2F2	5’- CGTCCCTGAGTTCCCAACC-3’	5’- GCGAAGTGTCATACCGAGTCTT-3’
E2F4	5’- ATCGGGCTAATCGAGAAAAAGTC-3’	5’- TGCTGGTCTAGTTCTTGCTCC-3’