<prompt> Mast cells release?IFN-gIL-5HistamineLysozyme  <response>: Ans. is c i.e., Histamine o Mast cells reside and mature in tissues. They are the most important cells in immediate hypersensitivity and are also the most important source of histamine.o Other secretions are : Serine proteases, Carboxypeptidases, Glycosidoses, Proteoglycans, Sulfatases. 