gsf abnormal limbs 7 gsf abnormal limbs mutant 7|gsf abnormal limbs 7|Gsfali7 Mhdaali7 MGI:2681239 Martin Hrabe de Angelis abnormal limbs 7 gsf abnormal limbs mutant 7 O Gene heritable phenotypic marker Gsfali7 http://identifiers.org/mgd/MGI:2681239