Table 1. The effect of DSF:Cu and ionising radiation on cellular accumulation at the G₂ checkpoint.

	Control	DSF:Cu	5 Gy	DSF:Cu + 5 Gy
SK-N-BE(2c)	30.5 ± 0.63	34.5 ± 1.63	53.7 ± 5.05*	40.4 ± 0.51¶
UVW	23.0 ± 0.83	33.9 ± 2.57**	56.1 ± 1.40***	44.0 ± 0.50††¶¶

The percentages of unsynchronised SK-N-BE(2c) and UVW cells in G2-M, 12 h after irradiation and exposure to 0.3 μM DSF:Cu, were determined by FACS analysis of propidium-iodide-stained cells. Data are means ± SEM, n=3. One-way ANOVA with Bonferroni correction was used to compare the means of the test groups with those of the untreated control (*), with those of the irradiated group (†) or compared with those treated with DSF:Cu alone (¶). One symbol: P<0.05; two symbols: P<0.01; three symbols: P<0.001.