1. K. J. Oh and W. L. Hubbell, Jules Stein Eye Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-7008, USA.
2. H. Zhan, C. Cui, R. J. Collier, Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.
3. K. Hideg, Central Research Laboratory, Chemistry, University of Pécs, H-7643 Pécs, Hungary.