(a)
(b)
(c)
(d)
Figure 3: Special stains for GOC. (a, b) Periodic acid-Schiff- (PAS-) and periodic acid-Schiff diastase- (PAS-D-) positive goblet cells showing glycogen-rich cells. (c) Note the glandular-like structure stained by PAS-D. Mucin-secreting cells were also identified.