CD28 is a transmembrane protein found on T cells and exists as a disulfide-linked homodimer. CD28 plays a crucial role in T cell activation by providing a co-stimulatory signal upon binding its ligand, thereby enhancing the immune response. What is the ligand for CD28?

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CD28 is an inhibitory molecule, and HLA-DO is its ligand

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CD28 is the sole costimulatory molecule necessary for the activation of naïve, immature lymphocytes; no specific ligand exists

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CD28 deactivates T cells by binding to its ligand IgRIII

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B7.1/B7.2 (CD80/CD86) molecules on APCs

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CD28 is essential for the initial activation signal of basophils, and the ligand is known as IgA

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CD28 is a transmembrane protein found on T cells and exists as a disulfide-linke...

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