IV PURIFICATION OF PROTEINS FROM THE AROMATIC 



AMINO ACID PATHWAY 62 



Results 62 



Discussion 53 



V PROPERTIES OF THE S-PROTEINS 76 



Results 76 



Discussion 104 



VI SPECIFIC ANTIBODY TO THE BIFUNCTIONAL 



S- PROTEIN AND TO TWO POST-PREPHENATE 



PROTEINS 108 



Results 108 



Discussion 116 



VII CLONING cDNAS ENCODING THE BIFUNCTIONAL 



S-PROTEIN, ADH AND PAT 118 



Results 118 



Discussion 132 



SUMMARY 148 



REFERENCES 14 9 



BIOGRAPHICAL SKETCH 157 



IV 



