To identify cell type-specific binding partners, experiments were performed using lysates prepared from two different cell lines, the murine FL5.12 hematopoietic cells used previously for SAR studies (Garsi et al, 2018; Chen et al, 2016; Garsi et al, 2019; Fransson et al, 2013; Perryman et al, 2016) and the murine prostate cancer epithelial (mPCE) cell line isolated from a prostate tumor in the SH-BC-893-sensitive PTEN/p53 pDKO mouse model (Kim et al, 2016). The gene discussed is PTEN; the disease is breast cancer.