I cannot confirm the 100% accuracy of the following definitions. They are my attempt to summarize what I’ve read online, in texts and papers, and from talking to people who know much more than me. Ple [..]

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protein complexes that occur at cell-cell junctions. They provide strong mechanical attachments between adjacent cells. Found in mesaxons

Any of the various substances that, when recognized as non-self by the adaptive immune system, triggers an immune response, stimulating the production of an antibody