About the Authors

Tiziano Gaiotto

Affiliation Biotherapeutics Group, National Institute for Biological Standards and Control, a centre of the Medicines and Healthcare Products Regulatory Agency, Blanche Lane, South Mimms, Potters Bar, Herts, EN6 3QG, United Kingdom

Simon E. Hufton

simon.hufton@nibsc.org

Affiliation Biotherapeutics Group, National Institute for Biological Standards and Control, a centre of the Medicines and Healthcare Products Regulatory Agency, Blanche Lane, South Mimms, Potters Bar, Herts, EN6 3QG, United Kingdom

Competing Interests

An international patent application (PCT/GB2012/052164) covering the monoclonal antibodies described in this study has been filed. This does not alter adherence to all of the PLOS ONE policies on sharing data and information.

Author Contributions

Conceptualization: TG SEH. Investigation: TG SEH. Methodology: TG SEH. Project administration: SEH. Supervision: SEH. Visualization: TG. Writing – original draft: TG SEH. Writing – review & editing: TG SEH.