Fig. 10From: Harderian gland of flying and non-flying birds: morphological, histological, and histochemical studiesLight micrograph of the HG of ibis (A, B, C) and pigeon (D, E, F) showed the secretory acini (Ac), lumen of collecting duct (Lu), irregular lumina (zigzag arrows), and note the distribution of lymphocytes in the lobule (star). Stain, H&E in A, B, D, E, and F and Masson trichrome in CBack to article page