A key skill in biomolecular modeling is displaying and annotating active sites in proteins. This technique is demonstrated using four popular free programs for macromolecular visualization: iCn3D, Jmol, PyMOL, and UCSF ChimeraX.
Procko, K., Bakheet, S., Beckham, J. T., Franzen, M. A., Jakubowski, H., Novak, W. R. P. Modeling an Enzyme Active Site using Molecular Visualization Freeware. J. Vis. Exp. (178), e63170, doi:10.3791/63170 (2021).