You have access
Sensitive and specific two-site immunoradiometric assays for human insulin, proinsulin, 65-66 split and 32-33 split proinsulins
W J Sobey, S F Beer, C A Carrington, P M S Clark, B H Frank, I P Gray, S D Luzio, D R Owens, A E Schneider, K Siddle, R C Temple, C N Hales
Biochemical Journal Jun 01, 1989, 260 (2) 535-541; DOI: https://doi.org/10.1042/bj2600535