Table I.

Primer sequences.

Gene	Upstream primer	Downstream primer	Amplified fragment (bp)
TYR	5′TCACGGCTCTGTTGAATGTCT3′	5′CTGAAGTTGGGCGAGATGAT3′	300
TRP-1	5′ACATCATTCCCTCACCAAAGAC3′	5′AGAAGTCCGAAAGCCAAGTAAA3′	303
TRP-2	5′GTTCCTTTCTTCCCTCCAGTG3′	5′TTCCTTTATTGTCAGCGTCAG3′	300
ERK1	5′GGGAGGTGGAGATGGTGAAG3′	5′AGCAGGTTGGAGGGCTTTAGAT3′	441
ERK2	5′ACCCACACAAGAGGATTGAAGT3	5′AAAAGCCACAACTACCAGAAAC3′	353
JNK2	5′CCTTCTTTACCAGATGCTTTGTG3′	5′ATACGGTCAGTGCCTTGGAATA3′	303
β-actin	5′CGTGGACATCCGCAAAGAC3′	5′AAGAAAGGGTGTAACGCAACTA3′	302

TYR, tyrosinase; TRP-1, tyrosinase related protein 1; TRP-2, tyrosinase related protein 2; ERK1, extracellular signal-regulated kinase 1; ERK2, extracellular signal-regulated kinase 2; JNK2, c-Jun N-terminal kinase 2.