Fig. 1From: A genome-wide association study reveals a locus for bilateral iridal hypopigmentation in Holstein Friesian cattlePhenotypic appearance of iridal hypopigmentation. HF cattle were ophthalmological and neurological examined and irises underwent histologic evaluation. a and b: Coat color of affected cattle was typical for the breed and without any sign for albinism. Both cattle were normally developed at time of examination. c-f: Iris color of cases a and b. The degree of discoloration clearly differed between cases. All affected cattle showed a bicolored iris with a central ring of silver-blue and a peripheral ring of brown-gray. Iris color within one iris showed alternating darker and lighter parts Back to article page