About the Authors

Ulrika Johansson

Affiliations Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, the Biomedical Centre, S-750 07, Uppsala, Sweden, The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, S-171 76 Stockholm, Sweden

Massimiliano Ria

Contributed equally to this work with: Massimiliano Ria, Karin Åvall

Affiliation The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, S-171 76 Stockholm, Sweden

Karin Åvall

Contributed equally to this work with: Massimiliano Ria, Karin Åvall

Affiliation The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, S-171 76 Stockholm, Sweden

Nancy Dekki Shalaly

Affiliation Division of Protein Technology, School of Biotechnology, KTH Royal Institute of Technology, S-106 91 Stockholm, Sweden

Sergei V. Zaitsev

My.Hedhammar@slu.se (MH); Sergei.Zaitsev@ki.se (SVZ)

Affiliation The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, S-171 76 Stockholm, Sweden

Per-Olof Berggren

Affiliation The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Karolinska University Hospital, S-171 76 Stockholm, Sweden

My Hedhammar

My.Hedhammar@slu.se (MH); Sergei.Zaitsev@ki.se (SVZ)

Affiliations Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, the Biomedical Centre, S-750 07, Uppsala, Sweden, Division of Protein Technology, School of Biotechnology, KTH Royal Institute of Technology, S-106 91 Stockholm, Sweden

Competing Interests

The authors have read the journal's policy and the authors of this manuscript have the following competing interests: MH has shares in Spiber Technologies AB, a company that aims to commercialize recombinant spider silk. POB is the founder of the Biotech Company Biocrine AB and is also a member of the board of this company. SZ is a consultant for Biocrine AB. POB and MH are members of the board of Betamatrix, a company jointly owned by Spiber Technologies AB and Biocrine AB. There are no patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials, as detailed online in the guide for authors.

Author Contributions

Conceived and designed the experiments: UJ SZ POB MH. Performed the experiments: UJ MR KÅ NDS MH. Analyzed the data: UJ MR KÅ NDS SZ MH. Wrote the paper: UJ POB MH.