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Interactions of the back side of the RecA-2 domain (green ribbon model) with the RecA-1 domain, the linker between the two RecA domains (blue) and the N-terminal extension (yellow). (a) The surface of RecA-1 is coloured gold and surface-exposed N and O atoms are coloured blue and red, respectively. (b) The surface of RecA-2 is coloured green and surface-exposed N and O atoms are coloured blue and red, respectively.
