EFFECTS OF MITOMYCIN C ON HUMAN CHROMOSOMES

Abstract
Mitomycin C inhibits mitosis and causes breaks and exchanges in the chromosomes of cultured human leukocytes. The distribution of breaks is nonrandom with a marked excess of breaks in the secondary constriction regions of chromosomes Nos. 1,9, and 16. When not broken, these regions frequently show extreme attenuation and negative heteropycnosis.