There are several commercial sources where you can obtain recombinant or isolated GPIb or GPIIb/IIIa proteins for assay development. Here are a few examples:
R&D Systems (https://www.rndsystems.com/): R&D Systems offers a range of recombinant proteins, including GPIb and GPIIb/IIIa proteins, suitable for assay development and research purposes.
Abcam (https://www.abcam.com/): Abcam provides a variety of recombinant proteins, including GPIb and GPIIb/IIIa proteins, for use in various applications, including assay development and drug discovery.
Novus Biologicals (https://www.novusbio.com/): Novus Biologicals offers recombinant GPIb and GPIIb/IIIa proteins for assay development and research purposes.
Sino Biological (https://www.sinobiological.com/): Sino Biological offers a wide range of recombinant proteins, including GPIb and GPIIb/IIIa proteins, suitable for various applications, including assay development.
Fitzgerald Industries International (https://www.fitzgerald-fii.com/): Fitzgerald provides a selection of GPIb and GPIIb/IIIa proteins, both recombinant and isolated, for research and assay development.
When purchasing these proteins, it is important to carefully review the product descriptions, specifications, and data sheets provided by the suppliers to ensure that the specific protein meets your requirements for assay development.