6A4N:
reference: X-ray crystallographic analysis of time-dependent binding of guanidine hydrochloride to HEWL: First steps during protein unfolding., Raskar T, Koh CY, Niebling S, Kini RM, Hosur MV, Int J Biol Macromol. 2019 Feb 1;122:903-913. doi: 10.1016/j.ijbiomac.2018.11.023., Epub 2018 Nov 6. PMID: 30412756

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