IFN-gamma KO IFN-g KO http://identifiers.org/mgd/MGI:1857184 IFNgamma- IFN-gammaKO MGI:1857184 IFNgamma KO ifng<-> targeted mutation 1, Timothy Stewart gko IFN-gamma- IFN-gamma<tm1Ts> Null/knockout Ifng<tm1Ts> Ifngtm1Ts Ifn<tm/Ts> Ifng<tm1>Ts ifg<tm1> GKO Ifn-g<tm1Ts> ifn<tm1Ts>