STEIN, Dirson João et al. Melatonin induces a state-dependent analgesic effect, but not after chronic administration in rats. Clinical and Biomedical Research, [S. l.], v. 46, 2026. DOI: 10.22491/2357-9730.153271. Disponível em: https://seer.ufrgs.br/index.php/hcpa/article/view/153271. Acesso em: 27 ago. 2026.