Tryptophan-tryptophan energy transfer and classification of tryptophan residues in proteins using a therapeutic monoclonal antibody as a model Kayser, V.; Chennamsetty, N.; Voynov, V.; Helk, B.; Trout, B.L. Journal of Fluorescence 21(1): 275-288 2011 1573-4994 10.1007/s10895-010-0715-0 https://eurekamag.com/research/056/699/056699134.php