| 6UKN: reference: Cryo-EM structure of the potassium-chloride cotransporter KCC4 in lipid nanodiscs., Reid MS, Kern DM, Brohawn SG, Elife. 2020 Apr 14;9. pii: 52505. doi: 10.7554/eLife.52505. PMID: 32286222 |
This OCA 
Structure page
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(documentation).