Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Upper part (a) and (b). Chemical structures of melatonin (MEL) and all-trans retinoic acid (ATRA). (a) MEL, (b) ATRA. Lower part (c) and (d). Concentration dependence of the cytotoxic effects of MEL and ATRA. Cells were seeded in a 96-well plate at a density of 5 × 103 cells per well and treated with indicated concentrations of (a) MEL and (b) ATRA for 96 h. The data are presented as means ± S.D. of ten separate experiments.
