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Neural stem cell proliferation and differentiation in vitro. Phase contrast microphotographs illustrating dense clusters of proliferative neural cells (arrows) which are present in NSC culture from primary cortical tissue (left panel), as well as in NSC cultures derived from human iPS cells (right panel). In both cases, differentiating, process-bearing neurons (arrowheads) emerge from the proliferative core. Scale bar: 50 μm
