<entry id="a7" term="Allosteric enzyme">
  <definition>An <a href="#e3">enzyme</a>
that contains a region to which small, regulatory molecules
("effectors") may bind in addition to and separate from the
substrate binding site and thereby affect the catalytic
activity.
  </definition>
  <description>On binding the effector, the catalytic activity of the
<strong>enzyme</strong> towards the substrate may be enhanced, in
which case the effector is an activator, or reduced, in which case
it is a de-activator or inhibitor.
  </description>
</entry>