文献:Baumjohann D, Preite S, Reboldi A, Ronchi F, Ansel KM, Lanzavecchia A, Sallusto F. Persistent antigen and germinal center B cells sustain T follicular helper cell responses and phenotype. Immunity. 2013 Mar 21;38(3):596-605. doi: 10.1016/j.immuni.2012.11.020. Epub 2013 Mar 14. PMID: 23499493.。