Twisted Beta Sheet
from Arabinose Binding Protein

Java version

HTML 5 version (does not require Java; downloads and moves slowly)

I. Introduction

Notice the parallel natures of the strands.  The protein sequences connecting these strands are removed for clarity

For more information see Biochemistry Online: Chapter 2C - Understanding Protein Conformation

II. General Structure

Ball/Stick and Cartoon
Ball and Stick with H bond in blue. The H bonds are shown between a blue N and a red O as H atoms are not present on structures determined by X-Ray crystallography.
Cartoon with H bonds