Fig. 9. Loss of ß does not enhance other ßPS mutant phenotypes. (A,B) Embryos lacking maternal and zygotic ßPS or both ß subunits were stained with anti-filamin 1 antibodies to label somatic muscles. The muscle phenotypes of single and double ß integrin mutants are identical. (C) Cuticles from embryos lacking ßPS or both ß subunits exhibit an equal frequency of the dorsal hole and tail-up phenotypes, owing to the failure of dorsal closure and germ band retraction, respectively.