Two alleles of the sex-linked gene tabby, Ta and Tac, and two autosomal mimics of tabby, crinkled, cr, and downless, dl, each produce a similar mutant syndrome involving the coat and dentition of the mouse. Certain aspects of the development of the mutant defects have already been studied, and some comparisons between tabby and crinkled have been made. The present investigation is concerned with a comparison of all four genes, and with further analysis of the developmental basis for the dental abnormalities.

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