Complement Factor B

**Definition:** A glycine-rich, heat-labile serum glycoprotein that contains a component of the C3 CONVERTASE ALTERNATE PATHWAY (C3bBb). Bb, a serine protease, is generated when factor B is cleaved by COMPLEMENT FACTOR D into Ba and Bb.

**Tree numbers:** - D08.622.200 - D08.811.277.656.300.760.198 - D08.811.277.656.959.350.198 - D12.776.124.486.274.900 - D12.776.811.243.200

**Synonyms:** - Complement Factor B, Alternative Pathway - Complement Protein B - Complement Protein Factor B - Factor B - Properdin Factor B - C3 Proactivator - Complement 3 Proactivator - C3PA