Although not all molecules have additional hetero atoms or ligands bound to them besides water, those that do may have them attached in a region unknown to the user. To help the user identify the regions of a molecule in which hetero atoms are bound, this movie zooms in on each bound substrate one at a time and shows the surrounding residues that may play a part in attracting it to that region. To help the substrates stand out from the cartoon represented protein, they are colored using the CPK color scheme and represented as transparent spheres and sticks.