1, nucleotide binding stator subunits (“cylinders”) (F: 2WPD | A: 3A5C | V: 3A5C); 2, central stalk (“crankshaft”) (F: 2WPD | A: 3A5C | V: 3AON); 3, A/V rotor subunit (... #x0201c;adapter”) (A: 1R5Z | V: 1R5Z); 4, rotor ring (“turbine”) (F: 4B2Q | A: 1C17 | V: 2BL2); 5, ion channel forming subunit (no structure available); 6, peripheral stalk (“pushrod”) (F: 4B2Q [2B05/2CLY/2WSS] | A: 3K5B | V: 4DL0 and 4EFA); 7a and b, A/V peripheral stalk connector subunits (“rockers”) (A: 3RRK | V: 3RRK and 1U7L); 8, small central stalk subunit (“ratchet” in prokaryotes) (F: 2WPD | A: 3A5C | V: 3AON); 9, eukaryotic additional central stalk subunit (“lock”) (2WPD); 10, IF 1 (“brake”) (1OHH); 11, eukaryotic V-type additional peripheral stalk subunit (“brake”) (1HO8).