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Expression of the peripheral lymph node HR l-selectin on circulating specific ASC and total ISC in volunteers 7 days after oral (a; n = 4) or rectal (b; n = 9) vaccination with S. typhi Ty21a. The bars indicate arithmetic means (±SD) of percentages of cells expressing l-selectin among IgA (black bars), IgG (white bars), and IgM (hatched bars) ASC and ISC.
