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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:

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!

P, Q, A, Bare concentrations of some sort- Keq is the equilibrium constant
- Ka, Kb, Kp, Kq are the Michaelis constants

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# Recognize this irreversible equation for kinetic modeling?

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