Mutant embryos show grossly normal morphology, normal segmentation, normal epidermal denticle belts and normal patterning of the neuromusculature. They show greatly reduced movement compared to wild-type. Mature embryos show striking defects in individual muscle fibre morphology.
Selected as: an embryonic lethal mutation with abnormal locomotory behaviour but grossly normal neuromusculature.
Based on the lethal stage and antibody staining, sls alleles form the series: slsS000201 (weakest), slsB173, slsC995, slsj1D7, slsB68, slsC872 (strongest).