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This edition of ‘Then and now’ re-examines Lise Heding’s very highly cited paper ‘Radioimmunological determination of human C-peptide in serum’, which was published in Diabetologia in 1975. We show how this article and other related articles by Heding contributed to heightened respect for C-peptide (and transformation of Heding’s research programme). Initially thought of as an inert discard, C-peptide...
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