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.
A branched molecule is shown on the left with four sticky ends, X, complementary to X', and Y, complementary to Y'. Four of them are shown to assemble to form a quadrilateral, with further sticky ends on the outside, so that an infinite lattice could be formed by the addition of further components.
