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Morphological response of rat EGF-responsive neuronal embryonic progenitor cells promoted by PGI. (A) After 4 days of cultivation in the absence of PGI, the neuronal progenitor cells formed a single sphere of undifferentiated morphology, compared with a differentiated morphology of neurite outgrowth treated with 2 ng/ml PGI (B), 20 ng/ml PGI (C), and 200 ng/ml PGI (D).
