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Summary A mammary tumor cell line, designated MTCL, was successfully established from a mouse primary mammary tumor (MTP). The MTCL cells retain cytokeratin and both estrogen receptor (ER) and progesterone receptor (PR) in vitro. In vitro exposure of MTCL cells to progesterone causes a decrease in the cellular 3H-thymidine uptake, indicating an inhibition by progesterone on MTCL cellular deoxyribonucleic...
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