Shop online for a wide selection of MilliporeSigma Harleco Histology/Papanicolaou Stains: EA-50 Papanicolaou Staining Solution Harleco™ Histology/Papanicolaou Stains Also known as the Pap test, Pap smear and Smear test A Pap test is a microscopic examination of cells that are scraped from a mucosal surface after being stained with Papanicolaou stain.

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