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.
Original Repository. Alan Mason Chesney Medical Archives. Daniel Nathans Collection. 12640. Monograph. Coupon, William. [Portrait of Daniel Nathans and Hamilton Smith with a model of DNA]. Uniquely Johns Hopkins. Johns Hopkins University. School of Medicine, [1988]. P. 20. Photographic Print. Portrait. 1 Image.