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Figure 4.
Detail of the HasA∼HasR∼heme complex showing a putative
heme access channel extending from the external medium between
L3 and the bent loop L4 to the receptor heme-binding site. HasA
and HasR are indicated as a CPK model in red and blue,
respectively, except for the heme-coordinating HasR histidines
that are colored yellow. The heme is indicated as a wire frame
model in green and the Fe^3+ atom as a red sphere.
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