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A) ClustalW amino acid alignment shows similarities between BmHRG-1 and CeHRG-1. Identical residues are shown in black, while conserved residues are in gray. B) The putative membrane topology of BmHRG-1 includes 4 transmembrane domains (boxed regions in A, as predicted by TMHMM 2.0) as well as a conserved histidine residue (His100) and C-terminal motif (YIYHY, dark circles) important for heme uptake (38).
