4MJN:
reference: Crystallographic structure of the turbine C-ring from spinach chloroplast F-ATP synthase., Balakrishna AM, Seelert H, Marx SH, Dencher NA, Gruber G, Biosci Rep. 2014 Apr 1;34(2). pii: BSR20130114. doi: 10.1042/BSR20130114. Print, 2014 Apr 1. PMID: 27919036

This OCA Structure page
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