fold

(fōld )

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1. A ridge or a crevice formed when a flexible surface doubles back on itself.
SYN: SEE: plica
2. A bend, as in a polypeptide that determines its in-situ three-dimensional structure.
3. A particular three-dimensional folded shape assumed by a polymer, such as a protein.
4. A thin, doubled sheet extending from a tissue or a cell.

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