
Keywords: SHetA2; N-(2,3-dihydro-2,2,4,4-tetramethyl-6-benzothiopyranyl), Nâ²-(4-nitrophenyl)thiourea; ATRA; all trans retinoic acid; NOAEL; no observed adverse effect level; MTT; 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; MTS; MTT coupled with