Merck Manual

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Vaginal cytology, anucleated superficial cells
Vaginal cytology, anucleated superficial cells

These cells are also referred as "cornified" epithelial cells. The cell nucleus is faded or absent as observed under a simple microscope. The background of the slide is clear without debris. The bitch is receptive to a male during this time.

Courtesy of Dr. Mushtaq Memon.