This digitally-colorized scanning electron micrograph (SEM) depicted a Giardia muris protozoan adhering itself to the microvillous border of an intestinal epithelial cell. Each small circular profile under the protozoan represents the rounded tip of a single microvillous, and it is estimated that 2000 to 3000 microvilli cover the surface of a single intestinal epithelial cell. The two circular lesions on the right side of the photograph are impressions made by the ventral adhesive disk of othe