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Immunohistochemical localization of CD3+ T cells in the interfollicular area of ileum (a), CD45RA+ naïve T cells in the lamina propria and between crypts of jejunum (b), CD45RC+ memory T cells in ileal lamina propria and Peyer’s patches (c), CD21+ B cells (d) and SWC3+ myeloid cells (e) in the lamina propria of ileum from 4-week-old pig as demonstrated by ABC method; original magnification 200×.
