Assertion: alimentary canal's cell | /r/HasProperty | dark staining
Facets:
Source sentences:
text: Surface secretory sheet gland (secreting mucus) folded macroscopically to form gastric rugae; gastric pits; gastric simple branched tubular glands; mucous neck cells; parietal cells (pale staining); zymogen (chief) cells (dark staining) in the deeper regions of glands; muscularis mucosae; extensive submucosa; muscularis externa (part).