Marymount Manhattan College 1 article published in JoVE Biology Using Mouse Mammary Tumor Cells to Teach Core Biology Concepts: A Simple Lab Module Victoria McIlrath1, Alice Trye1, Ann Aguanno1 1Department of Natural Sciences, Marymount Manhattan College A feasible laboratory module for biology undergraduates that explores advanced cellular and molecular concepts using animal cell culture is described. Students grow, characterize and manipulate a breast cancer cell model by exposure to chemotherapy agents. Cell viability is assayed through cell counting using both a standard and novel method.