Reverse genetics
In molecular genetics, identifying genes purely on the basis of their position in the genome, with no knowledge whatsoever of the gene product. In classic genetics, the traditional approach was to find a gene product and then try to identify the gene itself. Also known as positional cloning.
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- 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.
- 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 […]