passages.id: 1.0alpha7.train.878.sent
passages.type: sentence
passages.text: The crystal structure of REGα reveals a 20–30 Å-wide aqueous channel through a donut-shaped heptamer (Knowlton et al., 1997), and electron microscopic images suggest that REG heptamers bind the proteasome with their aqueous channels normal to and centered over the proteasome α subunit ring (Gray et al., 1994).
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