Tradition of basic and applied pigment cell research in Marseilles

Melanogenesis, thyroid hormones and catecholamines synthesis share the same amino acid, free L-tyrosine for melanogenesis and catecholamines synthesis , L-tyrosine residues for thyroid hormones synthesis. The author describes basic and applied research on Melanogenesis and thyroid hormones metabolism in Biochemistry laboratory, School of Medicine, Marseilles since his arriv al in 1962. He gives a short review of his participation in these two areas during his career in Marseilles, Yaounde and Boston.