CD9 Antigen

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

**Definition:** CD9 antigen (228 aa, ~25 kDa) is encoded by the human CD9 gene. This protein is involved in both sperm-egg fusion and platelet degranulation.

**Synonyms:** - 5H9 Antigen - Antigen CD9 - CD9 - Cell Growth-Inhibiting Gene 2 Protein - Leukocyte Antigen MIC3 - MRP-1 - Motility-Related Protein - Motility-Related Protein -1 - Tetraspanin-29 - Tspan-29 - p24