Table 2.

Oprl1 and Cart gene expression in DA and WOKW rats relative to 18S mRNA

Strain	Oprl1		Cart
	Males	Females	Males	Females
DA	1.06 ± 0.16a (N = 5)	1.55 ± 0.33a* (N = 6)	1.22 ± 0.11d (N = 5)	0.59 ± 0.22 (N = 6)
WOKW	0.92 ± 0.23b (N = 6)	1.51 ± 0.23b* (N = 8)	4.95 ± 0.69c,d* (N = 6)	5.83 ± 0.45c* (N = 8)

^aOprl1 gene expression differs significantly between DA males and DA females (*P < 0.05)

^bOprl1 gene expression differs significantly between WOKW males and WOKW females (P < 0.005)

^cCart gene expression differs significantly between WOKW males and WOKW females (P < 0.001)

^dCart gene expression differs significantly between DA males and WOKW males