targeted mutation 1a, Helmholtz Zentrum Muenchen GmbH http://identifiers.org/mgd/MGI:4847739 HEPD0687_1_D07 MGI:4847739 EUCOMM-projects HEPD0687_1_C06 HEPD0687_1_D08 Mog<tm1a(EUCOMM)Hmgu>