Transgene Tg(Col2a1-Npr2)25-4Gar transgene insertion 25-4, David L Garbers GCB2-Tgm transgene http://identifiers.org/mgd/MGI:3722764 MGI:3722764 O GCB2-Tgm|Tg(Col2a1-Npr2)25-4Gar Tg(Col2a1-Npr2*B2)25-4Gar