Figure 1.

Cross-section of a growth hormone and growth hormone receptor complex Cross-section of a growth hormone and growth hormone receptor complex [PDB:1A22] showing the burial level pattern. A layer of atoms in the front are shown as spheres while those at the back are shown as sticks. The colors from green to red indicate the burial level of atoms from 0 to 4. The largest burial level is 4 here. The largest burial level of atom within a protein/protein complex depends on its size, shape and the nearby atoms’ organization.

Li et al. BMC Systems Biology 2011 5(Suppl 1):S5   doi:10.1186/1752-0509-5-S1-S5