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Transmission electron micrographs of SFB attached to the intestinal epithelium. (a) SFB (arrow) attached to the apical portion of the enterocyte. Magnification, ×4,300. (b) SFB extending through an M cell and into intimate association with a mononuclear cell (MC). Magnification, ×4,300. (c) The SFB segments (arrow) which are below the M cell (M) and which are most intimately associated with the mononuclear cell are irregularly shaped and less electron dense. Magnification, ×11,500.
