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Atomic details of intersubunit interactions. Interactions in 5-start in L-type (a) and R-type (b), 11-start (c), 16-start in L-type (d) and R-type (e), and 6-start (f). CPK model: key residues. Those in magenta and yellow are involved in permanent interactions with residues in other subunits; those in red and orange are always involved in sliding interactions; those in blue and green are involved in switch interactions.
