Dorsal vessel and visceral mesoderm is unaffected but major distortions occur in somatic mesoderm. Mild allele: Late stages of embryonic development show some unfused myoblasts.
Selected as: a mutation that shows lethality over the "rost30A" chromosome. The "rost30A" chromosome contains mutations in two genes: rost30A and sns43-49. sns6 has been shown to be allelic to sns43-49 rather than to rost30A.