tryptophan 2,3-dioxygenase

n.
  1. An oxidoreductase whose concentration is regulated by hormones produced in the adrenal glands; it is present in the liver.tryptophanase
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.