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XYPPX repeat (two copies) This repeat is found in a wide variety of proteins and generally consists of the motif XYPPX where X can be any amino acid. The family includes annexin VII, the carboxy tail of certain rhodopsins. This family also includes plaque matrix proteins, however this motif is embedded in a ten residue repeat. The molecular function of this repeat is unknown. It is also not clear if all the members of this family share a common evolutionary ancestor due to its short length and biased amino acid composition.
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