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The structures of two stereoisomers of GPI. Structure I is the sole form present in Aquifex spp. and a minor component in the archaeon Archaeoglobus fulgidus, which accumulates primarily the form represented by structure II. The carbon atoms of glycerol are numbered stereospecifically: i.e., the carbon atom that appears on the top of the Fischer projection that has the hydroxyl group at carbon 2 pointing to the left is designated C-1 (26).
