THE ORIGIN OF IgA‐CONTAINING CELLS IN INTESTINAL LYMPH OF SHEEP

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Abstract
The origin of IgA-containing cells in sheep intestinal lymph was determined by antigenically stimulating a mesenteric lymph node and by studying afferent intestinal lymph. Since antigenic stimulation of the node resulted almost exclusively in the appearance of IgG1 antibody-containing cells, it was proposed that IgA-containing cells are normally produced either in the Peyer's patches or lamina propria of the intestine. These conclusions were supported by studying lymph obtained by cannulation of a lymphatic duct afferent to the mesenteric lymph node. Study of the cells in afferent lymph revealed the presence of a significant population of IgA-containing blast cells. This was convincing evidence that the IgA-containing cells normally found in intestinal lymph originate from sites in the intestine.

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