USLU S, YORUK M. Morfological and Histometric Studies on Mast Cell Distribution and Heterogeneity, Present in the Lower Respiratory Tract and in the Lung of Local Duck (Anas platyrhnchase) and Goose (Anser anser). Kafkas Univ Vet Fak Derg, 19 (3): 475-482, 2013. DOI: 10.9775/kvfd.2012.8064