1. Division
of Infectious Diseases and Geographic Medicine, Stanford University, 300 Pasteur Drive, Lane L-134, Stanford, California 94305-5107, United States
2. California Institute for Medical Research, 2260 Clove Drive, San Jose, California 95128, United States
3. Departamento
de Biologia Celular, Molecular e Bioagentes Patogênicos Faculdade
de Medicina de Ribeirão Preto Avenida dos Bandeirantes, Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, Sao Paulo 14049-900, Brasil
4. Department
of Genetics, Stanford University, 300 Pasteur Drive, Stanford, California 94305-5120, United States