Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Periodical. Lederberg, Joshua. "Continuing Confusion" [re: Social Status and Sex Ratio]. Nature 365, 6441 (2 September 1993): 8. Article. 1 Image.. Nature. Lederberg UI. P296