Figure 8.

SNS expression is not detected in morphologically distinct founder cells in embryos blocked for myoblast fusion. sns^XS5 and mbc^D11.2 mutant embryos were analyzed for the presence of morphologically distinct founder cells (Rushton et al. 1995) that express either MHC or SNS. (A,B) Lateral view of a Stage 16 embryo homozygous for the non-null sns allele sns^XS5, immunostained for SNS (A) or MHC (B). (C,D) Lateral view of a Stage 16 embryo homozygous for mbc^D11.2, immunostained for SNS (C) or MHC (D). Arrows in B and D indicate the positions of elongated founder cells that are visualized by their expression of MHC. By contrast, no such cells are revealed by expression of SNS.