Chorionic villus sampling
A procedure for first-trimester prenatal diagnosis. Abbreviated CVS. CVS may be done between the eighth and tenth weeks of pregnancy. The aim is to diagnose severe abnormalities that are present in the fetus. Tissue is withdrawn from the villi of the chorion, a part of the placenta, and then prepared for diagnostic analysis.
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Choroid: In the eye, a thin vascular layer between the sclera and the retina. The choroid supplies blood to the retina and conducts arteries and nerves to other structures in the eye.
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Choroiditis: An inflammation of the layer of the eye behind the retina, either in its entirely (multifocal choroiditis) or in patches (focal choroiditis). Usually the only symptom is blurred vision. See also uveitis.
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Chromatids: The daughter strands of a duplicated chromosome joined together by a centromere.
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Chromatin: The nucleoprotein material of chromosomes. Chromatin is essentially the substance of chromosomes. It is made up of DNA attached to a protein structure, together with chromosomal RNA. Chromatin exists in two states, euchromatin and heterochromatin, with different staining and functional properties.