B6 vitamin

What are the two enzymes along with vitamin B6 that participate in the synthesis of tryptophan into serotonin?

I believe one of them is 5HT-Decarboxylase but I am unsure of the second enzyme.

1. tryptophan hydroxylase
2. 5-hydroxytryptophan decarboxylase
Tryptophan becomes 5-hydroxytryptophan under the influence of tryptophan hydroxylase.
Then 5-hydroxytryptophan is decarboxylated by 5-hydroxytryptophan decarboxylase to serotonin
http://books.google.com/books?id=LCvLCMvczMMC&pg=PA69&lpg=PA69&dq=%22hydroxytryptophan+decarboxylase%22+%22tryptophan+hydroxylase%22&source=web&ots=1GKPdF4nEE&sig=Gfz8taQpixmV7jBX3NXqfBpz7Y4
Vitamin B6 101

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