Hi all, I'm trying to come up with velocity equations for a multi-enzymatic system and came across this velocity equation. Does anyone recognize this equation? There was no citation or derivation and the variables were not explained. This is my guess: P, Q, A, B are concentrations of some sort Keq is the equilibrium constant Ka, Kb, Kp, Kq are the Michaelis constants I also find it odd that I found this under the "2 substrates" section, because it seems like there are 4 substrates here. If anyone has anything to contribute regarding this equation, I'd be very thankful!