Periarteriolar lymphoid sheaths
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Periarteriolar lymphoid sheaths (or periarterial lymphatic sheaths, or PALS) are a portion of the white pulp of the spleen. They are populated largely by T cells, which are presented with blood borne antigens by myeloid dendritic cells.
(This is in contrast to the lymphoid portions of the white pulp, where B cells predominate.)
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