TEV protease (white) complexed with peptide substrate (black) with active site triad residues (red) based on 1lvb
<a href="//commons.wikimedia.org/wiki/User:Evolution_and_evolvability" title="User:Evolution and evolvability">Thomas Shafee</a>
CC BY 4.0
<cite style="font-style:normal">Thomas, Shafee, (2014). "<a rel="nofollow" class="external text" href="https://www.repository.cam.ac.uk/handle/1810/245207">Evolvability of a viral protease: experimental evolution of catalysis, robustness and specificity</a>". <i>PhD Thesis</i>. University of Cambridge.</cite>