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DYS is short for DNA Y-chromosome Segment, and is used to designate a segment of DNA on the Y chromosome where a sequence of nucleotides repeats. These sequences are known as short tandem repeats (STRs), and are called markers in genealogical DNA testing. The possible variations of repeats at a DYS marker are known as alleles.

Some testing companies have different formats for the way DYS markers are written, for example, the location 455 may be written as DYS455, DYS 455, DYS#455, or DYS# 455.

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This page uses content from the English language Wikipedia. The original content was at DYS (DNA). The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.

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