Structural study of melanocortin peptides by fluorescence spectroscopy: identification of 'beta'-(2-naphthyl)-D-alanine as a fluorescent probe - Fernandez, Roberto M.; Ito, Amando S.; Schiöth, Helgi B; Lamy, Maria Teresa Moura (Biochimica et Biophysica Acta-General Subjects, 2003)