marker

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marker

 [mahr´ker]
something that identifies or that is used to identify; see also determinant.
cell-surface marker an antigenic determinant found on the surface of a specific type of cell.
tumor marker a biochemical substance indicative of presence of a tumor; ideally, it should be specific, sensitive, and proportional to tumor load. Called also biomarker.

mark·er

(mark'ĕr),
1. A device used to make a mark or to indicate measurement.
2. A characteristic or factor by which a cell or molecule can be recognized or identified.
3. A locus containing two or more alleles that, being harmless, are common and therefore yield high frequencies of heterozygotes, that facilitate linkage analysis.

marker

(mär′kər)
n.
1. A biomarker.
2. A genetic marker.

marker

Medspeak
A value or indicator of the presence of a disease.

Molecular biology
An identifiable physical location on a chromosome (e.g., restriction enzyme cutting site, gene, minisatellite, microsatellite), the inheritance of which can be monitored. Markers can be an expressed region of DNA (gene encoding a protein) or a segment of DNA with no known coding function but whose pattern of inheritance can be determined. A marker can be localised to a specific region of the genome (e.g., all markers on the human transcript map are STSs).

Markers have also been defined as a genetic trait, of which one allelic form is selected or screened for after recombination. 

Suicidology
A potential physiologic indicator or predictor of an increased risk of suicide, the most promising of which is a decrease in serotonin in the brain.

marker

Internal medicine A diagnostic indicator for presence of a disease. See Biomarker, Bone marker, Breast marker, Cardiac marker, Cell marker, Cell surface marker, Gene marker, Genetic marker, Kinesic marker, Microsatellite marker, Pan B-cell marker, Pan T-cell marker, Selectable marker, Selected marker, Surface marker, Surrogate marker, Tumor marker.

mark·er

(mahrk'ĕr)
1. A device used to make a mark or to indicate measurement.
2. A characteristic or factor by which a cell or molecule can be recognized or identified.
3. A locus containing two or more alleles that, being harmless, are common and therefore yield high frequencies of heterozygotes that facilitate linkage analysis.

marker

1. A trait, condition, gene, or substance that indicates the presence of, or a probable increased predisposition to, a medical or psychological disorder.
2. A gene whose location on a chromosome is known so that it can be used as a point of reference for MAPPING new mutations.

marker

see GENETIC MARKER.

mark·er

(mahrk'ĕr)
1. A device used to make a mark or to indicate measurement.
2. A locus containing two or more alleles that, being harmless, are common and therefore yield high frequencies of heterozygotes, which facilitate linkage analysis

Patient discussion about marker

Q. what is a safe tumor marker number range?

A. depends on the marker...most of the markers are materials that found normally in our body. and there are a number of markers and their levels differentiate. what marker do you mean?

Q. My wife(53) has elevated CEA and CA19.9 levels - near 150, without any concomitant reason/observation? Comment

A. Hi Bobby3,

The most important question is why were these tests done?
An elevated level may result from many causes, some of them are simple and some are more problematic. IMHO the best thing would be consulting her doctor to consider the need to check-up her alimentary system.
You can read more here (http://www.ascocancerfoundation.org/patient/ASCO+Resources/Patient+Guides/ASCO+Patient+Guide:+Tumor+Markers+for+Gastrointestinal+Cancers) and here (http://www.cancer.gov/cancertopics/factsheet/Detection/tumor-markers)

More discussions about marker
References in periodicals archive ?
IEBC said the indelible marker pens must utilize ink that "does not contain poisonous ingredients in a quantity that is toxic to humans." The ink should meet national safety standards such as being free from benzene, chlorinated compounds, aniline oils and any other noxious or toxic material.
It is recommended to use indelible marker pen with arrow extending to the site.
Simon Parish wrestled with oil paints on big canvases but is now attracting attention by making pictures with marker pens.
Even fundamental packing items and other accessories which are easily forgotten such as wrapping paper, bubblewrap, packing tape, contents labels and marker pens are all available as well as a check list to remind customers about the various tasks required when moving.
And alongside paint, Andrew Bick uses wax, marker pen and perspex to reveal a process of painting as a visual puzzle.
The tag is the word 'Buck' and has been seen written in marker pen and gold spray paint.
All neighbourhood policing teams have been issued with cycle security kits, consisting of a special marker pen to mark bikes with their owner's post code and ultraviolet lights so that officers can check bikes whilst out on patrol.
Police are urging people to get a lock and to have their house number and postcode engraved or security marked on their bike using a permanent ultraviolet marker pen.
It is claimed local papers received copies of the infamous September dossier with the reference to the 45-minute claim highlighted in yellow marker pen.
Once all the patchwork squares have been painted and are completely dry, go over the pencil lines with a ruler and a black marker pen.
Once all the patchwork squares have been painted and are completely dry go over the pencil lines with a ruler and a black marker pen.
High-visibility set so children can be seen in the dark, pounds 5, Bhs; Inset, name labels, pounds 1, Bhs, or laundry marker pen and 60 labels, pounds 1.99, Sainsbury's.