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Haem-transporter, endosomal/lysosomal, haem-responsive gene HRG1 is a family of conserved, membrane-bound permeases that reside in distinct intracellular compartments and bind and transport haem in metazoa. These proteins carry four transmembrane domains, 4xTMs, modelled here in two pairs, the two N-terminal and the two more C-terminal.
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