Medical Glossary

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19186
medical terms

Chimera




Chimera

An organism composed of cells derived from at least two genetically different individuals.

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Organism
A living thing, such as an animal, a plant, a bacterium, or a fungus.



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Cell memory
If foreign substances (e.g. bacteria) enter the body, the immune system reacts by attacking and killing them. At the same time, T-cells and B-cells produce a population of memory cells. If you are subsequently exposed to the same bacteria, the immune system reacts much more quickly. In allergy, this mechanism is called "priming". You do not experience an allergic reaction the first time you are exposed to a particular allergen, but your body registers the allergen and, over time, you may develop an allergy to it.

Challenge test
See Provocation test

Corticosteroid drugs
Anti-inflammatory drugs that interfere with the immune system, suppress it and thereby dampen the inflammatory overreaction. They can be used to treat a number of allergic diseases - e.g. allergic rhinitis, eczema and rheumatoid arthritis. Corticosteroid drugs come as creams, inhalants, tablets and eye drops.

Cell line
A general term applied to a defined population of cells that has been maintained in culture for an extended period and usually has undergone a spontaneous process, called transformation, that allows the cells to continue dividing (replicating) in culture indefinitely.

Comparative genomic hybridization (CGH)
A chromosomal screening technique that permits the detection of quantitative changes in chromosomal copy number without the need for cell culturing. It provides a global overview of chromosomal gains and losses throughout the whole genome (including extra, missing, and broken chromosomes), but cannot detect small changes in DNA sequence or changes in the imprinting state of a gene.

Chimera

Chorion
The outermost of the two membranes surrounding the embryo/fetus, part of which forms the fetal portion of the placenta.

Cleavage
The process of cell division in the very early embryo before it becomes a blastocyst.

Cleavage pattern
The pattern in which cells in a very early embryo divide; each species of organism displays a characteristic cleavage pattern that can be observed under a microscope. Departure from the characteristic pattern usually indicates that an embryo is abnormal, so cleavage pattern is used as a criterion for preimplantation screening of embryos.

Clone
1) An exact genetic replica of a DNA molecule, cell, tissue, organ, or entire plant or animal. 2) An organism that has the same nuclear genome as another organism.

Cloning
The production of a clone. (For the purpose of this report, generating an individual animal or person that derives its nuclear genes from a diploid cell taken from an embryo, fetus, or born individual of the same species.)

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This dictionary contains 19186 terms.







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