About the Authors

Frida Berg

Affiliation Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden

Ulla Gustafson

Affiliation Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden

Leif Andersson

To whom correspondence should be addressed. E-mail: Leif.Andersson@imbim.uu.se

Affiliations Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden , Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

LA conceived and supervised this study. FB and LA designed the experiments. FB and UG performed the experiments. FB and LA analyzed the data and wrote the paper.