Table I.

Primer sequences used in the quantitative polymerase chain reaction experiments.

mRNA	Forward primer	Reverse primer
GAPDH	5′-CTATAAATTGAGCCCGCAGC-3′	5′-ACCAAATCCGTTGACTCCG-3′
Aggrecan	5′-CTACACGCTACACCCTCGAC-3′	5′-ACGTCCTCACACCAGGAAAC-3′
Type I collagen	5′-GTTCAGCTTTGTGGACCTCCG-3′	5′-GCAGTTCTTGGTCTCGTCAC-3′
Type II collagen	5′-AAGCTGGTGAGAAGGGACTG-3′	5′-GGAAACCTCGTTCACCCCTG-3′
Type X collagen	5′-CGCTGAACGATACCAAATGCC-3′	5′-TTCCCTACAGCTGATGGTCC-3′
Sox9	5′-AAGCTCTGGAGACTTCTGAACG-3′	5′-CGTTCTTCACCGACTTCCTCC-3′