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ARP–HSA interactions. Interactions of Arp7 and Arp9 with the Snf2 HSA domain showing prominent interacting side chains from the HSA helix. Structures were aligned on the entire actin/ARP molecule. The helix direction is indicated with an arrow that points in the N to C direction of the helix. Equivalent views are shown for the actin complex with gelsolin (PDB code 1EQY) (43) and with ciboulet (PDB code 1SQK) (44).
