Table 1.

Sequences of primers

Genes	Forward primers	Reverse primers	Accession number	Nucleotide position
β-actin	ACGGCCAGGTCATCACTATTG	TGGATGCCACAGGATTCCAT	X03672	811–904
MOR	TGCACCCTCACGTTCTCTCA	TGAGGACCGGCATGATGA	AF347691	4120–4210
DOR	AAGGCTGTGCTCTCCATTGAC	TGTAGCGGTCCACGCTCAT	S66181	343–421
KOR	TGATCCTGCGCCTGAAGAGT	ATGCGGCGGAGATTTCG	L11065	931–1000
PPE	AGAAGCGAACGGAGGAGAGAT	TTCAGCAGATCGGAGGAGTTG	M13227	288–389
PPD	GCGTGGTCCAGGCTGATG	AGGCAGTCCGCCATAACATT	U64968	4–71
POMC	CCTGCTTCAGACCTCCATAGATG	GGATGCAAGCCAGCAGGTT	NM-008895	48–142