Reverse transcriptase
An enzyme that permits DNA to be made, using RNA as the template. A retrovirus, such as the HIV virus, can propagate itself by converting its RNA into DNA with reverse transcriptase.
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- Reye syndrome
A sudden, sometimes fatal, disease of the brain (encephalopathy) with degeneration of the liver, occurs in children (most cases 4-12 years of age), comes after the chickenpox (varicella) or an influenza-type illness, is also associated with taking medications containing aspirin. The child with Reye (pronounced rye) syndrome first tends to be unusually quiet, lethargic (stuporous), […]
- RFID
Radio frequency identification, a system for remotely storing and retrieving data. RFID tags can serve to identify and track medications.
- RFLP
Restriction fragment length polymorphism. A difference in DNA between people that can be recognized by the use of a restriction enzyme.
- Rh factor
An antigen found on the surface of red blood cells. Red blood cells with the antigen are said to be Rh positive (Rh+). Those without the surface antigen are said to be Rh negative (Rh-). Blood used in transfusions much match donors for Rh status as well as for ABO blood group, as Rh- patients […]
- Rh incompatibility
the first twin was hydropic (swollen with edema fluid) and stillborn, and the second of the twins was deeply jaundiced and subsequently died of kernicterus.