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Death of precursor cells on laminin, L1, or PLL substrate, 5 d after plating with growth factors or 10 d after plating (5 d without and 5 d with growth factors) is similar. A, TUNEL labeling of precursor cells grown on PLL, L1, or laminin substrate. B, Percentage of TUNEL+ cells of all cells as detected by DAPI staining. Scale bar, 250 μm. Values are means + SEM.
