Madin-Darby canine kidney cells
Madin-Darby canine kidney (MDCK) cells are a model mammalian cell line used in biomedical research. MDCK cells are used for a wide variety of cell biology studies including cell polarity, cell-cell adhesions (termed adherens junctions), collective cell motility, toxicity studies, as well as responses to growth factors.
Source: Wikipedia — Madin-Darby canine kidney cells (CC BY-SA 4.0)