Figure 7

Illustration of the density of NK cells in ovine JPPs, IPP and CP. In the B cell containing follicles located in the submucosa, a higher density was found in jejunal Peyer’s patches (JPPs) and colon patch (CP) compared to the almost NK cell empty follicles of the ileal Peyer’s patch (IPP). In the T cells rich area between the follicles and beneath the lamina muscularis mucosae; the interfollicular area (IFA), the density of NK cells was higher in IPP than in JPPs and CP, while in lamina propria of the villi had a lower density in IPP compared to JPPs and CP. In the dome area, covering the follicles, the density was lower in CP compared to IPP and JPPs. Dome (D); follicle (F); follicle-associated epithelium (FAE); interfollicular area (IFA); lacteal in villus (L); lamina propria (LP); submucosa (S).