Gross cystic disease fluid protein (GCDFP-15), also designated glycoprotein (gp) 17, is a prolactin-induced, secretory, actin-binding protein. GCDFP-15 is primarily expressed in cells with apocrine function such as acinic cells of the breast, salivary glands, sweat glands, and lacrimal glands as well as seminal vesicle.
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