what is str
From Wikipedia, the free encyclopedia. Short tandem repeat analysis (STR) is a molecular biology method used to compare specific loci on DNA from two or more samples.A short tandem repeat is a microsatellite, consisting of a unit of two to thirteen nucleotides repeated hundreds of times in a row on the DNA strand.STR analysis measures the exact number of repeating units.TR analysis is a tool in forensic analysis that evaluates specific STR regions found on nuclear DNA. The variable (polymorphic) nature of the STR regions that are analyzed for forensic testing intensifies the discrimination between one DNA profile and another.