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Dorsal longitudinal flight muscle (DLM) abnormalities in the Drosophila SPL null mutant Sply. Whereas the hemithoraces of the Canton-S wild-type fly invariably contains six DLM fibers of equal proportion, Sply homozygotes exhibit a general pattern of missing fibers, asymmetric development and compensatory hypertrophy of remaining fibers. Shown here is a Sply homozygote with only four DLM fibers in the right hemithorax. The upper DLM fiber in each row is marked with an arrow.
