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