REFEREES 2007 The editors acknowledge the efforts of the following referees who have expended their time to provide reviews of manuscripts submitted along 2007. Their contributions have been essential to maintaining the high standard of the journal: Alexandre Salino André Victor L. Freitas Astrid Kleinert Benedito Lopes Carlos J.E. Lamas Eneida Skinazi Helena Matthews-Cascon Herculano Alvarenga José Roberto Pujol-Luz Lana S. Sylvestre Leonardo M. Versieux Marcelo Duarte Marcelo F. Vasconcelos 80 Marcelo G. Santos Maria Lucia Kawasaki Michael L. May Miriam Gimenes Natalia von Ellenrieder Paulo H. Labiak Evangelista Rafaela C. Forzza Ricardo B. Machado Rogério R. da Silva Tereza Sposito Terry Griswold Thales de Lema Vinícius Antônio O Dittrich