title: Similarities among the pre-S regions of hepatitis B viruses: analogy with retroviral transmembrane proteins.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004279:DNA, Viral; D005814:Genes, Viral; D006515:Hepatitis B virus / Q000235:genetics*; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics*; D014176:Protein Biosynthesis; D012190:Retroviridae / Q000235:genetics*; D014759:Viral Envelope Proteins / Q000235:genetics*; D014764:Viral Proteins
chemical_list: D004279:DNA, Viral; D008565:Membrane Proteins; D014759:Viral Envelope Proteins; D014764:Viral Proteins