Table 1 The sequence of PCR primers used in this experiment

MMP-1 sense

5'-CCT AGC TAC ACC TTC AGT GG-3'

338 bp

MMP-1 antisense

5'-GCC CAG TAC TTA TTC CCT TT-3'

MMP-13 sense

5'-TTG AGG ATA CAG GCA AGA CT-3'

311 bp

MMP-13 antisense

5'-TGG AAG TAT TAC CCC AAA TG-3'

MMP-2 sense

5'-ACT TCA GGC TCT TCT CCT TT-3'

288 bp

MMP-2 antisense

5'-TTC AGA CAA CCT GAG TCC TT-3'

MMP-9 sense

5'-TAC CCT ATG TAC CGC TTC AC-3'

345 bp

MMP-9 antisense

5'-GAA CAA ATA CAG CTG GTT CC-3'

β-actin sense

5'-TCA TGA GGT AGT CAG TCA GG-3'

305 bp

β-actin antisense

5'-CTT CTA CAA TGA GCT GCG TG-3'