6KKR:
reference: Cryo-EM structures of the human cation-chloride cotransporter KCC1., Liu S, Chang S, Han B, Xu L, Zhang M, Zhao C, Yang W, Wang F, Li J, Delpire E, Ye S, Bai XC, Guo J, Science. 2019 Oct 25;366(6464):505-508. doi: 10.1126/science.aay3129. PMID: 31649201

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