L-tryptophan(out) + L-phenylalanine(in) => L-tryptophan(in) + L-phenylalanine(out)
l-tryptophan(out) + l-phenylalanine(in) => l-tryptophan(in) + l-phenylalanine(out)
L-tryptophan(out) + L-phenylalanine(in) => L-tryptophan(in) + L-phenylalanine(out)
l-tryptophan(out) + l-phenylalanine(in) => l-tryptophan(in) + l-phenylalanine(out)