But the cellular enzymes that copy the DNA in the chromosomes have a problem with the chromosome ends, called telomeres, and cannot copy them completely.

The intestinal villi secrete the enzyme called lactase (β-D-galactosidase) to digest it.

To each well of cerebrospinal fluid he added an enzyme called a re- verse transcriptase to change any viral RNA to DNA.

Dr. Ho gave ABT-538, an experimental drug that inhibits a crucial viral enzyme called a protease.

The PLA2G6 gene provides instructions for making an enzyme called an A2 phospholipase.

An enzyme called prostatic acid phosphatase (PAP), which speeds up certain chemical reactions.

An enzyme in ginger called protease digests protein, enabling it, in a marinade, to soften and tenderize meat.

And each lab independently came up with the same surprising discovery: an enzyme called cyclooxygenase that appeared whenever cells became cancerous or began proliferating.

Levodopa is converted to dopamine via the action of a naturally occurring enzyme called DOPA decarboxylase.

Here, in response to rising concentrations of copper, an enzyme called ATP7A releases copper into the portal vein to the liver.