Catalase abnormality in a Caucasian family in the United States.

An erythrocyte catalase with atypical electromigration velocity was discovered in three generations of a family of Scandinavian-British extraction. Six members are heterozygous for the hereditary autosomal character; no abnormal homozygotes were found. The condition is associated with normal erythrocyte catalase activity and with no clinical or subclinical disease.