Light micrograph of a longitudinal section of intestinal villi showing mucous-secreting goblet cells stained magenta among the absorptive columnar epithelial cells. Together with the microvilli, mucus forms a thin surface layer on the villi called the brush border. The villus core consists of connective tissue, vessels, nerves, and leukocytes. Paraffin section, haematoxylin-eosin/PAS stain. Magnification: x 170 when width printed at 10cm.