6X4X:
reference: Evolution of insulin at the edge of foldability and its medical implications., Rege NK, Liu M, Yang Y, Dhayalan B, Wickramasinghe NP, Chen YS, Rahimi L, Guo H, Haataja L, Sun J, Ismail-Beigi F, Phillips NB, Arvan P, Weiss MA, Proc Natl Acad Sci U S A. 2020 Nov 5. pii: 2010908117. doi:, 10.1073/pnas.2010908117. PMID: 33154160

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