Northern blot analysis of skeletal muscle RNA from 12-week-old lambs. Expression of five genes from the callipyge region is shown for the four possible genotypes in 12-week-old lambs. Each lane contains total RNA from an individual animal. The genotypes are given with the maternal allele first followed by the paternal allele. The callipyge allele (CLPG) has been abbreviated to C and the paternal heterozygote that has the callipyge phenotype is indicated with an asterisk (*). Strand specific probes are indicated on the left and transcript sizes are indicated on the right. The skeletal muscles shown are the longissimus dorsi (LD), semimembranosus (SM), gluteus medius (GM) and the supraspinatus (SP). The blots were hybridized with an 18S RNA probe to show the equivalence of RNA loading and transfer.