Table 1. Sequences of the primers used in the polymerase chain reaction (PCR).

Gene	Primer sequences (5–3)
MMP-3	Forward: TTTGGCCGTCTCTTCCATCC
MMP-13	Forward: ACCATCCTGTGACTCTTGCG
Collagen I	Forward: ATCAGCCCAAACCCCAAGGAGA
Collagen II	Forward: TGATGGGATCCAATGAGGGAGA
Aggrecan	Forward: AGGGACACCAACGAGACCTA
GAPDH	Forward: CAGAAGGACAGCTACGTGGG