Figure 4From: Possible attenuation of the G2 DNA damage cell cycle checkpoint in HeLa cells by extremely low frequency (ELF) electromagnetic fieldsFlow cytometry histograms of synchronised HeLa S3 cells. From left to right the histograms correspond to 7.5, 9, 10.5, 11.5 and 13 h after release of the second thymidine block. Categories 3 and 4 have been irradiated with a dose of 3 Gy in late S/early G2 phase.Back to article page