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External phenotypes of BOS/BOR patients. (A) The shapes of the two external ears of a patient are asymmetric. The right ear shows an affected phenotype whereas the left ear appears normal. (B) A patient showing a preauricular tag (blue arrow) and a second branchial arch fistula (red arrow). (Images downloaded from: http://pl.wikipedia.org/wiki/Zespół_skrzelowo-uszno-nerkowy and used under the terms of the Creative Commons Attribution-Share Alike 3.0 Unported license).
