B cell receptors, T cell receptors, and antigen-presenting cell machinery

This entry describes a non-standard, combined grouping of immune targets rather than a singular, defined molecule or receptor. B cell receptor (BCR), T cell receptor (TCR), and antigen-presenting cell (APC) machinery are each distinct molecular entities or complexes with unique structure, function, and classification. - B cell receptor (BCR): A complex consisting of membrane-bound immunoglobulin and associated signaling subunits, mediating antigen recognition and signal transduction in B cells. - T cell receptor (TCR): Composed primarily of α and β (or γ and δ) chains, coupled to the CD3 complex, recognizing antigen-MHC complexes and transducing activation signals in T cells. - Antigen-presenting cell (APC) machinery: Refers collectively to the set of molecules used by professional APCs (such as MHC class I and II, co-stimulatory molecules like CD80/CD86), essential for antigen processing and presentation to T cells. Grouping these together is incorrect for target annotation, as each component is typically specified independently in therapeutic, biomarker, and mechanistic studies. The correct convention would require separately structured entries for "B cell receptor", "T cell receptor", and key "antigen-presenting cell" molecules such as "Major histocompatibility complex class II molecule" or "CD80". Summary of issues: This entry is not a canonical molecular target but a collection of functionally related immune molecules. Each subcomponent has unique structural and mechanistic properties, and should be annotated as a distinct target. The grouping leads to loss of specificity and prevents accurate mapping to drugs, mechanisms, and biomarkers. Some molecular actors within "APC machinery" are not receptors at all, but include enzymes, chaperones, and surface proteins. Recommendation: Divide this entry into: - "B cell receptor (BCR)" - "T cell receptor (TCR)" - Specific "antigen-presenting cell" molecules (e.g., "Major histocompatibility complex class II molecule", "CD80", "CD86", "CD40"). For structured annotation, process each entity individually, using canonical naming and molecular detail per your conventions.