Melatonin immunoreactivity of epidermal skin is higher in the evening than morning but does not account for erythema sensitivity. - Nikkola, Veera; Huotari-Orava, Riitta; Joronen, Heli; Grönroos, Mari; Kautiainen, Hannu; Ylianttila, Lasse; Snellman, Erna; Partonen, Timo (Chronobiology International: The Journal of Biological & Medical Rhythm Research, 2023)