<prompt> Acid mucin is best demonstrated by the stain -Alcian bluePeriodic Acid Schiff P.A.S.Van GiesonReticulin  <response>: Mucin is produced by epithelial cells of mucous membrane mucous glands, as well as by some connective tissuesStains for mucinMucicarmineAlcian blue.Note :- Epithelial cell mucin stains positively with periodic acid-Schiff PAS, while connective tissue mucin does not. 