TwoFace
Inside vs. Outside
Let's focus on a single alpha helix and how it comes to rest once a myoglobin protein has settled in to its final configuration. In these representations, amino acid sidechains are shown in lighter versions of their atom colors (C = light gray, etc.)
Viewing mode ('Tunnel' is probably the most helpful for this exercise; if the protein is not showing up, re-set to 'Spacefill' first)
See-thru Ribbon