Is CD4(domain 1) CD4?

CD4(domain 1) is not the usual reference to the CD4 molecule, CD4 (cluster of differentiation 4) is an immune cell surface molecule commonly used for identifying and labeling helper T-lymphocytes (CD4+ T-cells).The CD4 protein consists of four structural domains, including an extracellular domain, a transmembrane domain, and an intracellular domain.In some literature, there is discussion and research on the specific structural domains of CD4.
In some literature, discussions and studies on specific structural domains of CD4 can be found.CD4 (domain 1) may refer to the first structural domain of the CD4 protein, also known as the D1 domain or the Ig-like V-type domain, and this structural domain plays an important role in the CD4 protein in interacting with other proteins.

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