There are about 5 steps that are involved in short tandem repeat. The 5 steps are DNA purification, Design primer, Sample preparation, Capillary electrophoresis and data analyzation.

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The human genome is full of repeated DNA sequences which come in various sizes and are classified according to the length of the core repeat units, the number of contiguous repeat units, and/or the overall length of the repeat region. DNA regions with short repeat units (usually 2-6 bp in length) are called Short Tandem Repeats (STR).

The sequence of DNA that is repeated varies significantly from individual to individual.

A short tandem repeat or STR is a type of polymorphism, where short sequences of DNA are repeated. It is a useful tool in forensics because the number of times a DNA sequence is repeated for a given STR varies between individuals.