I

Precursor—Ornithine

—Citrulline

—Arginine

Figure 5.12 A biochemical pathway illustrating one gene-one enzyme concept. Metabolic sequences are identified by the intermediates formed and purifying the enzymes that catalyze their conversion.

called me aside and expressed concern about his son's future. "Here he is," he said, "not clearly either biochemist or geneticist. What is his future?" I attempted to reassure him—and perhaps myself as well—by emphasizing that biochemical genetics was a coming field with glowing future and there was no slightest need to worry.

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