ISCN 1981 An International System for Human Cytogenetic Nomenclature (1981) Report of the Standing Committee on Human Cytogenetic Nomenclature: High-Resolution Banding, Paris, May 1980 Special Issue Vol. 17, No. 5 (1981) of 'Birth Defects'. Special Topic Issue: Cytogenetic and Genome Research 1981, Vol. 31, N