Abstract

Diplomyelia (duplication of the neural tube or spinal cord) was studied histologically in nine cases of T/+ mouse embryos at 10-15 days of gestation. Grüneberg investigated T/+ fetuses and interpreted the extra neural tube to be notochord, but a reexamination of this material demonstrated that the interpretation is incorrect. Diplomyelia is produced in the mutations Fused, Kinky, vestigial tail, homozygous Brachyury, and t-haplotype t9 and in the new mutation, NM 529, described here.

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