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Reprogramming Time-Course: Foreskin fibroblasts (Fate Therapeutics, San Diego, CA) that were reprogrammed in feeder free SMC4 small molecule conditions (Valamehr et al., 2012) were analyzed by flow cytometry using the BD Stemflow™ Human iPSC Sorting and Analysis Kit. Reprogrammed cells were analyzed and bulk sorted at day 21 post transduction (upper panels). Bulk sorted cells were further expanded and re-sorted at day 35 post-transduction (lower panels). Cells were sorted based on identifying cells in FSC vs SSC plot (P1), creating a child gate from P1 that includes CD13-/low cells (P2), and creating a child gate from P2 that includes SSEA-4+TRA-1-60+ cells (P3). Flow cytometry was performed on a BD FACS Aria™ III flow cytometry system.