Platelet Glycoprotein GPIb-IX Complex

**Definition:** Platelet membrane glycoprotein complex essential for normal platelet adhesion and clot formation at sites of vascular injury. It is composed of three polypeptides, GPIb alpha, GPIb beta, and GPIX. Glycoprotein Ib functions as a receptor for von Willebrand factor and for thrombin. Congenital deficiency of the GPIb-IX complex results in Bernard-Soulier syndrome. The platelet glycoprotein GPV associates with GPIb-IX and is also absent in Bernard-Soulier syndrome.

**Tree numbers:** - D09.400.430.890.625.460 - D12.776.395.550.625.460 - D12.776.543.550.625.460 - D12.776.543.750.705.675.568

**Synonyms:** - Glycoprotein Ib-IX Complex