Peak heights of the chromatograms of added steroids precursor ions and their metabolites in the cell culture medium.

The values are from the cell culture medium of three replicates equally pooled together.NC = peak heights of the chromatograms of added steroids and their metabolites before cell culture; C = peak heights of the chromatograms of added steroids and their metabolites after cell culture; C-50 µM api = peak heights of the chromatograms of added steroids and their metabolites under the incubation with 50 µM of apigenin after cell culture. The peak height values are presented after division by 10000 (cps/10000).N.D. = the values are undetectable.