Gamma-amino methionine hydrolase is an fictional protein invented by Michael Crichton. It the novel it is found in the saliva of Procompsognathus.


It is stated in the novel that is used as a genetic marker for genetic manipulation.

The rest of its function can be deduced from its name. Methionine is associated with the start codon in RNA. Moreover, the -ase ending suggests the macromolecule is an enzyme. It then seemed logical that Crichton might use this as a genetic marker as it starts the production of proteins.