KKU-055 and KKU-213B cell lines were obtained from the Japanese Collection of Research Bioresources (JCRB) Cell Bank (Osaka, Japan). The culture methods were previously described (10 (link)). Cell lines were routinely tested for mycoplasma. Palbociclib-resistant cell lines and single-resistant clones were generated as previously described (16 (link), 17 (link)).
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