p75<NGFR> NGFR<tm1Jac> p75-KO p75- Ngfr<tm1Jae> p75NTR- p75<NTR> KO p75<exonIII>- p75<NTR>exon3-null Ngfr<-> http://identifiers.org/mgd/MGI:1857226 p75<NTR-> p75NTR/ExonIII- MGI:1857226 p75e3- p75(III)<-> Null/knockout targeted mutation 1, Rudolf Jaenisch