Cell cycle distribution (%) of SCC-61, HaCaT, SQ-20B and OSCC-3 exposed to etoposide, EGCG, GT, MT or AT for 48 h; see Section 2 for details. Values are means ± SD from three independent experiments performed in triplicate. Bars with different letters are statistically different from the control (PBS) (P < 0.05) for each cell cycle stage, □ G0/G1; S; ■ G2/M, within treatments. IC50 concentrations were used and these differed depending on extract and cell line tested (see Table 1).