Staining of beta-galactosidase activity fromlacZ(Am) genes in suppressor-containing strains. suptRNA genes were introduced into lacZ(Am)-containing animals as described. Animals were heat shocked, stained for beta-galactosidase activity, and photographed. Representatives from those animals with the maximum numbers of cells stained are shown; because each cross generates both males and females, in some cases the animals shown are males (e.g., 24/+, upper animal; 29/+, both animals).