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Figure 1.
Structure of the ternary complex HasA∼HasR∼heme. HasA
(red) and HasR (cork domain beginning with residue Asn-113 in
orange; barrel domain beginning at residue Lys-241 in blue) are
indicated as a ribbon model. The first 5 strands and the loops
L1–L3 of HasR are omitted to allow a view into the barrel
interior. The heme is indicated as a wire frame model (green).
The extracellular loops 6–11 are labeled. Yellow parts of or
near L6, L8, and L9 mark positions of 6 residue deletions that
have been found to abolish HasA binding to the receptor.
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