Gravar-mail: 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