Rita Marker, a longtime advocate against assisted suicide, died Oct. 30 at the age of 83. Born in Washington state in 1940, Marker and her family settled in Steubenville, Ohio. After attending an ...

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Diagnostic markers are biological parameters that aid the diagnosis of diseases. Examples include the presence of particular genetic variants and the levels of particular proteins in body fluids.

Genetic markers are DNA sequences with known physical locations on chromosomes. They are points of variation that can be used to identify individuals or species, or may be used to associate an ...