Fig. 6. Histochemical reactivity of a conjunctiva to alcian blue/periodic acid Schiff reagent (AB/PAS). Secretory products present in the goblet cells of the conjunctiva reacted positively to AB/PAS, indicating the presence of both acidic (blue) and neutral (pink) glycoconjugates associated with the cells. epi, epithelium. Magnification ×200. (Reprinted from Shatos MA, Rios JD, Tepavcevic V, et al: Isolation, characterization, and propagation of rat conjunctival goblet cells in vitro. Invest Ophthalmol Vis Sci 42:1455–1464, 2001.)