Fig. 12From: Harderian gland of flying and non-flying birds: morphological, histological, and histochemical studiesLight micrograph of the HG of duck (A, B, C), goose (D, E), ibis (F, G), and pigeon (H, I). Positive reaction was observed in the centrally located cells of glandular epithelium of tubules and glandular epithelium of acini, in the connective tissue septa between the secretory end pieces and in the excretory duct with periodic acid Schiff reagent. Stain, PASBack to article page