we studied ( a ) the distribution and properties of fast and slow 125i-nerve growth factor ( 125i-ngf ) binding sites in cultured human neuroblastoma ( nb ) cell lines that were categorized as responsive ( n+ ) or unresponsive ( n- ) to ngf by neurite outgrowth , ( b ) whether fast or slow sites mediate actions of ngf , and ( c ) whether ngf-mediated conversion of fast to slow sites occurs in human nb and pheochromocytoma pc 12 cells .
C1417719
ngf
C0086418
human