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Published online by Cambridge University Press: 14 April 2009
A new developmental mutant is described in Xenopus laevis (Amphibia, Anura): muscle opacity (mo). Homozygotes die at larval stage 48. The underlying defect, visible at stage 47, is a degeneration of cephalic musculature. The mo gene is linked to the rusty locus, with a map distance of 6·1%.