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(a) Overview of crystal contacts of Erb1 monomer (blue) with symmetry related molecules (grey) shows that the top and bottom areas of the propeller are not involved in crystallographic interactions. (b) Helix H2 interacts with symmetrically related molecule (shown in pink). (c) 6C-7D loop penetrates deeply into a conserved cavity of another monomer (in pink). The residues directly involved in crystal packing are labelled in (b) and (c).
