Holding antigen where B cells can find it.
MacLennan
Ian
I
D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D006801:Humans; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology*