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The so-called 'H-fragment' of insulin is an extremely amyloidogenic double chain peptide consisting of the N-terminal parts of A-chain and B-chain linked by a disulfide bond between Cys-7A and Cys-7B. Here, we conduct a detailed investigation of the self-association behavior of H-fragment monomers into amyloid-like fibrils using kinetic assays, infrared spectroscopy, circular dichroism (CD), atomic force microscopy (AFM) and molecular dynamics (MD) simulations. Unlike the intact predominantly α-helical insulin, H-fragment remains in a di