title: Black discolouration of urine in two young sisters.
mesh_terms: D001741:Black or African American; D000474:Alkaptonuria / Q000175:diagnosis* / Q000235:genetics; D002648:Child; D003116:Color; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007223:Infant; D035781:Siblings; D016482:Urinalysis