1. Department of Molecular Cell
Physiology, VU University, De Boelelaan
1085, Room G-226a, 1081 HV Amsterdam, The Netherlands
2. Department of Chemistry and
Chemical Biology, Harvard University, Cambridge,
Massachusetts 02138, United States
3. Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742,
United States
4. Instituto
de Química
de São Carlos, Universidade de São Paulo, 13566-590 São Carlos, SP, Brazil