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'dividing': [61], 'Ret-positive': [62], 'cells': [63], 'differentiate,': [64], 'cluster': [65], 'into': [66], 'ganglia': [67], 'containing': [68], 'neurons': [69, 117, 167], 'glia,': [72], 'create': [74], 'extensive': [75], 'networks': [76], 'reminiscent': [77], 'plexus': [81], 'establishedin': [82], 'vivo.Glial': [83], 'cell-line-derived': [84], 'neurotrophic': [85], 'factor': [86], '(GDNF)': [87], 'neurturin': [89, 106, 131], 'both': [90, 116], 'potently': [91], 'support': [92], 'survival': [93, 154], 'proliferation': [95, 152], 'Addition': [103], 'either': [105], 'or': [107, 153, 168], 'GDNF': [108, 124, 133], 'cultures': [111], 'increased': [112], 'number': [114, 164], 'glia.': [120], 'Persephin,': [121], 'a': [122], 'third': [123], 'family': [125], 'member,': [126], 'shares': [127], 'many': [128], 'properties': [129], 'with': [130], 'central': [136], 'kidney': [141], 'development.': [142], 'By': [143], 'contrast,': [144], 'persephin': [145], 'does': [146, 160], 'not': [147, 161], 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