The importance of the HCV-NS4 peptide for the definition of serogical types of hepatitis C virus - Cavalheiro, Norma de Paula; Baroni, Antonio Alci; Tosta, Rosa Aparecida Borges; Suematsu, Sérgio; Cardoso, Maria Regina Alves (International Symposium on Hepatitis C Virus & Related Viruses, 2001)