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What is Acid mucin is best demonstrated by the stain - and explain in detail?
Mucin is produced by epithelial cells of mucous membrane & mucous glands, as well as by some connective tissues
Stains for mucin

Mucicarmine
Alcian blue.

Note :- Epithelial cell mucin stains positively with periodic acid-Schiff (PAS), while connective tissue mucin does not.