caa a22 4500 386393214 CHVBK 20180307112127.0 cr unu---uuuuu 161130e198904 xx s 000 0 eng 10.1017/S0016672300027993 doi S0016672300027993 pii (NATIONALLICENCE)cambridge-10.1017/S0016672300027993 Genetic studies on nucleolus organizer regions (NORs) in cattle [Elektronische Daten] Experimentally produced monozygotic twins, natural opposite sex blood chimeras (freemartins), and several pedigrees were used to evaluate the genetic influences on the nucleolus organizer region (NOR) patterns in cattle. In monozygotic twins, the NOR patterns of both twins are extremely similar. In chimeras, NOR patterns of genetically identical, peripheral blood lymphocytes (PBL) from the two partners resemble each other. In contrast, genetically different PBL (sib organ) differ significantly in the same environment. A high heritability of the individual NOR patterns is also demonstrated in our 23 pedigrees. In conclusion, our data demonstrate that variation in NOR expression is predominantly due to genetic factors. Copyright © Cambridge University Press 1989 Mayr B. Institute for Animal Breeding and Genetics, Veterinary University, Vienna, Austria Gruber K. Ludwig Bollzmann Institute for Immuno- and Cytogenetic Research, Vienna, Austria Brem G. Institute for Animal Breeding and Care, Ludwig Maximilian University, Munich, FRG Mayrhofer G. Institute for Animal Breeding and Genetics, Veterinary University, Vienna, Austria Genetical Research Cambridge University Press 53/2(1989-04), 111-118 0016-6723 53:2<111 1989 53 GRH https://doi.org/10.1017/S0016672300027993 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016672300027993 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mayr B. Institute for Animal Breeding and Genetics, Veterinary University, Vienna, Austria NATIONALLICENCE 700 1- Gruber K. Ludwig Bollzmann Institute for Immuno- and Cytogenetic Research, Vienna, Austria NATIONALLICENCE 700 1- Brem G. Institute for Animal Breeding and Care, Ludwig Maximilian University, Munich, FRG NATIONALLICENCE 700 1- Mayrhofer G. Institute for Animal Breeding and Genetics, Veterinary University, Vienna, Austria NATIONALLICENCE 773 0- Genetical Research Cambridge University Press 53/2(1989-04), 111-118 0016-6723 53:2<111 1989 53 GRH CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge