cf Cftr<m1Hgu> MGI:1856710 cftr<m1HGU> http://identifiers.org/mgd/MGI:1856710 targeted mutation 1, MRC Human Genetics Unit Cftr<TgH(neoim)1Hgu> EDI Cftr<TgH(neoim)Hgu> Cftr<tm1Hgu> Null/knockout