Objective To compare the alterations of transcriptional profiles between 2 Gy and 10 Gy γ- ray irradiated cells. Methods Human normal lymphoblastoid cell AHH-1 line was irradiated with cobalt-60 γ rays of 2 Gy or 10 Gy. cDNA microarray, containing the probes corresponding to 14,022 human genes, was used to develop the transcriptional profiles of the cells at 4 h after irradiation. Double microarray was carried out for each dose group, and a 2-fold increase or decrease in signal intensity was treated as significant change in gene expression. R...