claim: Doxycycline may cause cramps.
evidence: In enzymology , a D-tryptophan N-acetyltransferase is an enzyme that catalyzes the chemical reaction. enzymology. enzymology. enzyme. enzyme. catalyzes. catalysis. chemical reaction. chemical reaction. D-tryptophan. D-tryptophan. acetyl-CoA + D-tryptophan CoA + N-acetyl-D-tryptophan. acetyl-CoA. acetyl-CoA. D-tryptophan. D-tryptophan. CoA. coenzyme A. N-acetyl-D-tryptophan. N-acetyl-D-tryptophan. Thus , the two substrates of this enzyme are acetyl-CoA and D-tryptophan , whereas its two products are CoA and N-acetyl-D-tryptophan .. enzyme. enzyme. substrates. substrate ( biochemistry ). acetyl-CoA. acetyl-CoA. D-tryptophan. D-tryptophan. products. product ( chemistry ). CoA. coenzyme A. N-acetyl-D-tryptophan. N-acetyl-D-tryptophan. This enzyme belongs to the family of transferases , specifically those acyltransferases transferring groups other than aminoacyl groups .. enzyme. enzyme. The systematic name of this enzyme class is acetyl-CoA  :D - tryptophan N-acetyltransferase .. enzyme. enzyme. acetyl-CoA. acetyl-CoA. CoA. coenzyme A. systematic name. List of enzymes. Other names in common use include D-tryptophan acetyltransferase , and acetyl-CoA-D-tryptophan-alpha-N-acetyltransferase .. acetyl-CoA. acetyl-CoA. D-tryptophan. D-tryptophan. CoA. coenzyme A