Helix-Turn-Helix.
Leucine Zipper.
Zinc Finger.
Displays
Color DNA vs. Protein.
Color Secondary Structure:
a-Helix, b-Sheet, Turn, Loop.
Color by Element.
Cartoon.
Backbone Trace.
Backbone.
Wireframe.
Ball & Stick.
Spacefill.
Movies
Helices are perpendicular in HTH.
Nonpolar residues zip up a dimer.
Zinc stabilizes helix/loop fingers.