EPD0620_2_G07 EPD0620_2_E07 EPD0620_2_H06 targeted mutation 1a, Wellcome Trust Sanger Institute EUCOMM-projects EPD0620_2_D05 B2m<tm1a(EUCOMM)Wtsi> EPD0620_2_D07 EPD0620_2_B08 http://identifiers.org/mgd/MGI:4820252 MGI:4820252 EPD0620_2_B07