For an important chemical reaction, poikilotherms may have four to ten enzyme systems that operate at different temperatures.
The brain is provided with a number of enzyme systems which serve to co-ordinate its workings.
Or perhaps there is a whole enzyme system that sets up a chain of reactions intended to counteract some effect.
The researchers have also discovered that refrigerating a tomato turns off the enzyme system.
These same enzyme systems are probably also sensitive to changes in heat and light.
This in turn is another measure of how different their enzyme system is from yours.
Disruptions with these enzyme systems lead to the condition.
During pregnancy the placenta also expresses significant levels of this enzyme system.
But that same enzyme system is defective in 20 per cent of normal, healthy people.
One in five apparently has a potential problem, considering this one enzyme system alone.