A) RC enzyme activities in HeLa Cells treated with 400 μM BZF. HeLa cells were incubated for 5 days with 400 μM BZF and then assayed for RC complex activities. * = significant difference versus untreated (p<0.05). B) HEK293, primary skin fibrolasts and SEM cells (a leukaemia cell line) were treated with 400 μM BZF as in panel A and then assayed for COX activity. We did not detect significant changes in CS activity in any cell line after BZF tretment.