Fig. 2From: A genome-wide association study reveals a locus for bilateral iridal hypopigmentation in Holstein Friesian cattleHistological cross section through the ciliary zone of the left ventral iris near the collarette with characteristic Fuchs’ crypts. Comparison of the pigmentation of the three different iris layers anterior border layer (arrowheads), stroma (S), and posterior pigmented epithelium (P) of affected (a) and control animals (b). A distinct hypopigmentation of the anterior border layer (arrowheads) and the iridal stroma (S) in the affected animal (a) can be observed compared to the unaffected control animal (b). Thickness and pigment content of the double-layered posterior pigmented epithelium (P) is similar in both animals. HE staining, scale bar = 50 μmBack to article page