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Fig. 2. Phosphagen kinases (AK or CK) mediate most diffusive flux of ATP in muscle.
The red arrows indicate enzymatic catalysis and the black arrows net diffusive
flux. The relatively thick black arrows for phosphagen kinase mediated
diffusion indicates that the vast majority of net high-energy phosphate
diffusion occurs in the form of phosphagen (AP or PCr), rather than directly
as ATP (thin black arrows).