题目选项分析

Peyer's patches, located in the lowest portion of the small intestine, by means of regions of lymphatic tissue in the intestinal wall which identify antigens within the intestine, facilitating the immune response to them.

Peyer's patches, located in the lowest portion of the small intestine, are regions of lymphatic tissue in the intestinal wall that identify antigens within the intestine and facilitate the immune response to them.