The interior of proteins is packed very densely.Nonpolar residues V, L, I, M, and F are found in the interior of proteins.Charged polar residues \( \mathrm{R}, \mathrm{H}, \mathrm{K}, \mathrm{E} \), and D are usually found on the surfaces of proteins.Uncharged polar residues \( \mathrm{S}, \mathrm{T}, \mathrm{N}, \mathrm{Q} \), and Y are usually found on the surface of proteins, but may also be found in the interior.