Products of RT-PCR reactions from mixed male-female CS RNA (lanes 1 and 2) and male or female Tai RNA (males, lanes 3 and 4; females, lanes 5, and 6). desat1 primers (lanes 1, 3 and 5) or desat2 primers (lanes 2, 4, and 6) were used. Molecular weight standards (M) were included.