Interleukin-9

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** Interleukin-9 (144 aa, ~16 kDa) is encoded by the human IL9 gene. This protein plays a role in the growth of helper T-cells.

**Synonyms:** - Cytokine P40 - HP40 - Homolog of Mouse T Cell and Mast Cell Growth Factor 40 - IL-9 - IL9 - IL9 Protein - Interleukin 9 - Interleukin 9 Precursor - P40 T-Cell Growth Factor - P40 T-Cell and Mast Cell Growth Factor - T-Cell Growth Factor p40 - T-Cell/Mast Cell Growth Factor p40 - p40 - p40 Cytokine - p40 Protein