The 2-Minute Rule for stem cell
Mucosal and submucosal lymphoid tissue nodules are scattered through the intestines. While in the ileum, these nodules type the Peyer patches. M cells within the area epithelium covering the lymph nodules can engulf antigens intact in the intestinal lumen for the antigen-presenting cells beneath the mucosal area.As a toddler, you've entire independ