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. 2005 Jul 25;33(13):4164–4171. doi: 10.1093/nar/gki735

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© The Author 2005. Published by Oxford University Press. All rights reserved

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Graphical representation of part of the MAO ontology structure. Grey boxes represent concepts and coloured arrows represent relationships (red, is_a; blue, part_of; green, is_attribute). The major MAO concepts are described in the text.