The image to the left is an image of the MHC complex. The pink spirals are alpha helices.
They are part of the secondary structure of proteins. The yellow lines are beta sheets. If
you look closely you can see a peptide sequence bound in the binding site. Click
here to see the peptide a little better. That
white line near the bottom of the screen is it.
Okay, that's pretty. But what does it look like in real space? Take the next step.