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Enzymes from animal sources are frequently used for quality control of enzyme activity determination in clinical chemistry. For this purpose they should be very similar to human enzymes. It is shown that preparations of enzymes of diagnostic interest from human and porcine organs, purified in exactly the same way, have very similar pH-optima and apparent Michaelis constants for their substrates.

clinical chemistry and laboratory medicine

Isolation, pH-Optima and Apparent  Michaelis  Constants of Highly Purified Enzymes from Human and Animal Sources.  Comparison of Enzymes of Human and Animal Origin, I