1. Ubiquitous melatonin - Presence and effects in unicells, plants and animals;Hardeland;Trends Comp Biochem Physiol,1996
2. Melatonin and 5-methoxytryptamine in non-metazoans;Hardeland;Reprod Nutr Dev,1999
3. Non-vertebrate melatonin;Hardeland;J Pineal Res,2003
4. Melatonin in plants - focus on a vertebrate night hormone with cytoprotective properties;Hardeland;Funct Plant Sci Biotechnol,2007
5. The changing biological roles of melatonin during evolution: from an antioxidant to signals of darkness, sexual selection and fitness;Tan;Biol Rev,2010