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The effect of exogenous stimulatory ligands on growth of neuroblastoma (NB) cell lines. SK‐N‐SH (group 1), LAN‐1 (group 2) and NB‐69 (group 3) cell lines were incubated in RPMI1640 with/without stimulatory ligands such as IGF‐1, IGF‐2 and insulin at the indicated concentrations. Proliferation of cell lines was evaluated as cell numbers at the indicated time points, and it was repeated three times. Data are expressed as the mean (±SD).
