Frequencies of CCR5-D32, CCR2-64I and SDF1-3’A mutations in Human Immunodeficiency Virus (HIV) seropositive subjects and seronegative individuals from the state of Pará in Brazilia... oleh Fernanda Andreza de Pinho Lott Carvalhaes, Greice Lemos Cardoso, Antonio Carlos Rosário Vallinoto, Luiz Fernando Machado, Marluisa de Oliveira Guimarães Ishak, Ricardo Ishak, João Farias Guerreiro