When an attractive young clinician from Falmouth College asked me if I could explain some of the causes of my own retardation,
I told her that Professor Nemur was the man to answer that.
It was the chance he had been waiting for to show his authority,
and for the first time since we'd known each other he put his hand on my shoulder.
"We don't know exactly what causes the type of phenylketonuria that Charlie was suffering from as a child—
some unusual biochemical or genetic situation, possibly ionizing radiation or natural radiation
or even a virus attack on the fetus—whatever it was resulted in a defective gene which produces a,
shall we say, 'maverick enzyme' that creates defective biochemical reactions.
And, of course, newly produced amino acids compete with the normal enzymes causing brain damage."
The girl frowned. She had not expected a lecture, but Nemur had seized the floor and he went on in the same vein.
"I call it competitive inhibition of enzymes. Let me give you an example of how it works.
Think of the enzyme produced by the defective gene as a wrong key which fits into the chemical lock of the central nervous system—
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