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Morphology, proliferation rates, and tumorigenicity of MDA-MB-231 and MDA-MB-231-JYJ breast cancer cells. (A) MDA-MB-231 and (B) MDA-MB-231-JYJ cells were cultured in vitro and observed under an optical microscope. (C and D) The proliferation rates and tumorigenicity of these two cell lines were determined as described in the Materials and methods section. Results are presented as the mean ± SD of triplicate determinations. *P<0.05, ***P<0.001.
