Glycoprotein Ib
protein found in platelets

Glycoprotein Ib (GPIb), also known as CD42,
is a component of the GPIb-V-IX complex on platelets. The GPIb-V-IX complex binds von Willebrand factor, allowing platelet adhesion and platelet plug formation at sites of vascular injury. Glycoprotein Ibα (GPIbα) is the major ligand-binding subunit of the GPIb-V-IX complex. GPIbα is heavily glycosylated.
It is deficient in the Bernard–Soulier syndrome. A gain-of-function mutation causes platelet-type von Willebrand disease.
Autoantibodies against Ib/IX can be produced in immune thrombocytopenic purpura.
The public source identifies “Glycoprotein Ib” as protein found in platelets. This brief keeps that definition visible, then builds a research path around Glycoprotein, protein and found.
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This entry incorporates text from “Glycoprotein Ib” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.