Search on: DNA, CIRCULAR 
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Descriptor English:   DNA, Circular 
Descriptor Spanish:   ADN Circular 
Descriptor Portuguese:   DNA Circular 
Tree Number:   D13.444.308.283
Definition English:   Any of the covalently closed DNA molecules found in bacteria, many viruses, mitochondria, plastids, and plasmids. Small, polydisperse circular DNA's have also been observed in a number of eukaryotic organisms and are suggested to have homology with chromosomal DNA and the capacity to be inserted into, and excised from, chromosomal DNA. It is a fragment of DNA formed by a process of looping out and deletion, containing a constant region of the mu heavy chain and the 3'-part of the mu switch region. Circular DNA is a normal product of rearrangement among gene segments encoding the variable regions of immunoglobulin light and heavy chains, as well as the T-cell receptor. (Riger et al., Glossary of Genetics, 5th ed & Segen, Dictionary of Modern Medicine, 1992) 
Indexing Annotation English:   IM; /drug eff /ultrastruct permitted
History Note English:   74(73) 
Allowable Qualifiers English:  
administration & dosage adverse effects
agonists antagonists & inhibitors
analysis biosynthesis
blood cerebrospinal fluid
chemistry classification
chemical synthesis contraindications
drug effects diagnostic use
economics genetics
history immunology
isolation & purification metabolism
pharmacology physiology
pharmacokinetics poisoning
radiation effects supply & distribution
secretion standards
toxicity therapeutic use
ultrastructure urine
Record Number:   22154 
Unique Identifier:   D004270 

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