... therefore appear to be ruledout.Tests for a mechanism with the sugar phosphate as theleading substrate can similarly be made by comparing thedata for alternative coenzymes (Tables 1 and 2). ... The initial-rate behaviour gives no indicationof any complexities in NADP+binding.Alternative substratesAn alternative substrate, when available, can be a usefultool for differentiating kinetic ... Research and Conference Grants is alsogratefully acknowledged.REFERENCES1. Gaetani, G.F., Galiano, S., Canepa, L., Ferraris, A. M. & Kirk-man, H.N. (1989) Catalase and glutathione peroxidase...