Table 1. Primers sequences used for RT–PCR in this study.

Gene	Sense primer	Antisense primer
Col2	5′-TCTTTGGCTCACTGGACTCT-3′	5′-CCCCTCCTGCTGTGAAGTTG-3′
Col10	5′-GCAGCATTACGACCCAAGAT-3′	5′- CATGATTGCACTCCCTGAAG -3′
OP	5′-TGCACCCAGATCCTATAGCC-3′	5′-TGTGGTCATGGCTTTCATTG-3′
OC	5′-TCTGACAAAGCCTTCATGTCC-3′	5′ -AAATAGTGATACCGTAGATGCG-3′