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.
Orthonormal x-y-z base set and tetrahedral DNA-nucleotide set representation. Each of the three axes distinguishes a specific molecular class feature. Purines are distinguished from pyrimidines through x-coordinate. Amino are distinguished from keto through y-coordinate. Weak Watson-Crick hydrogen-bridge binding is distinguished from stronger binding through z-coordinate.
