L-tryptophan + ATP => L-tryptophyl-5'-AMP + diphosphate
l-tryptophan + atp => l-tryptophyl-5'-amp + diphosphate
L-tryptophan + ATP => L-tryptophyl-5'-AMP + diphosphate
l-tryptophan + atp => l-tryptophyl-5'-amp + diphosphate