CD81 Antigen

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** CD81 antigen (236 aa, ~26 kDa) is encoded by the human CD81 gene. This protein is involved in the regulation of the immune response and can promote Hepatitis C infection by binding to viral envelope proteins..

**Synonyms:** - 26 kDa Cell Surface Protein TAPA-1 - Target Of The Antiproliferative Antibody 1 - Tetraspanin-28 - Tspan-28