DYS (DNA)

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

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.