Expression of slouScer\UAS.cKa in the embryonic mesoderm under the control of both Scer\GAL4twi.PG and Scer\GAL4how-24B produces severe alterations in the muscle pattern; the patterns of the ventral and dorsolateral somatic muscles are severely disrupted, while the dorsal muscles show fewer disruptions, although some muscles have aberrant shapes and insertion sites. Many segments lack muscle 8 and lateral and dorsolateral adult muscle precursor cells, although ventral adult muscle precursor cells are still formed. Morphological changes are also seen in the dorsal vessel; some of the cardioblasts appear enlarged or are arranged in clumps instead of single rows.