Fig. 4.

Expression patterns of musculature genes in the bursa copulatrix are related to those in the female reproductive tract. PCA of expression of the 17 muscle genes that are the most highly expressed in the bursa copulatrix. PC1 and PC2 explain more than 60% of the variation in expression and are sufficient to cluster biological replicates by tissue type. Bursa copulatrix samples are closer to female reproductive tract than flight muscle. bc: bursa copulatrix; frt: female reproductive tract; csg: caterpillar salivary glands; fm: flight muscle; ag: adult gut; cg: caterpillar gut.