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Calcyclin

(Science: protein) prolactin receptor associated protein, one of a family of small (around 10 kD) calcium-binding proteins containing the EF hand motif, originally isolated from Ehrich ascites tumour cells, but human and rat forms now identified. Regulated through the cell cycle. Binds to annexin II (p36) and to glyceraldehyde 3 phosphate dehydrogenase.