We have studied the effect of gamma radiation on differentiation in ne
uroblastoma cell lines AF8 and SJ-N-KP. Growth inhibition and morpholo
gical and biochemical differentiation have been examined following rad
iation exposure to 1-10 Gy. Gamma radiation induced marked growth inhi
bition and morphological differentiation in a dose-and time-dependent
manner in both cell lines, and induced biochemical differentiation in
AF8 cells.