Phenylalanine and Tyrosine Biosynthesis in Escherichia coli K-12: Mutants Derepressed for 3-Deoxy- d -Arabinoheptulosonic Acid 7-Phosphate Synthetase (phe), 3-Deoxy- d -Arabinoheptulosonic Acid 7-Phosphate Synthetase (tyr), Chorismate Mutase T-Prephenate Dehydrogenase, and Transaminase A