<prompt> Mucin is not secreted byGoblet cellPaneth cellBrunners glandCrypts of Lieberkuhn  <response>: Paneth cells are a specific type of cell within the crypts of Lieberkuhn.These cells have atypically oriented bright eosinophilic granules containing a variety of antimicrobial proteins and play a role in mucosal immunity and not mucin secretionBrunners glands: are sub-mucosal mucus gland within the duodenum.Goblet cells: are mucin-secreting cells.Crypts of Lieberkuhn: are lined by goblet cells besides other cell types.These are thus also involved in mucin secretion. 