Fig. 13.

Molecular cartoons showing the variety of different allowed states and subsets of states considered in different models.^93,94 The states shaded in light blue correspond to the traditional MWC model. The states shaded in light pink correspond to a sequential model of the KNF form.¹⁵ The green box surrounds all of the states and generalizes the MWC scenario to include other intermediates. The version shown here is a slight variant on that presented in the excellent review by Hilser et al.⁹⁴