| Type | MGI:General | Description | on a 129S6/SvEvTac genetic backrgound, homozygous mutant embryos are evident at E8.5, although in lower than expected ratios; no mutant embryos are obtained after E9.5 on a 129S6/SvEvTac x Black Swiss outbred background, homozygous mutant mice are identified at E9.5, but not later |
