Early studies on gene amplification.
D000663:Amphibians; D000818:Animals; D001517:Coleoptera; D004261:DNA Replication; D005060:Europe; D005260:Female; D005823:Genetics / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D009865:Oocytes / Q000648:ultrastructure; D014481:United States