Erratum
In the report by M. J. Moses, L. B. Russell, and N. L. A. Cacheiro [Science 196, 892 (1977)], "Ohno and Cattanach's translocation" should have read "Cattanach's translocation." This was an editorial error. The X-autosome translocation was first described by B. M. Cattanach [Z. Vererbungs. 92, 165 (1961)]; irregular pairing of the X and Y chromosomes in this translocation was subsequently reported by S. Ohno and B. M. Cattanach [Cytogenetics 1, 129 (1962)].