Before revision:  More formally, a tandem duplication can be thought of as an operation that converts a string S = AXB into a string T = AXXB , and is denoted by S \Rightarrow T . As they appear to be involved in genetic disorders, tandem duplications are widely studied in computational biology.
After revision:  More formally, a tandem duplication can be thought of as an operation that converts a string S = AXB into a string T = AXXB . As they appear to be involved in genetic disorders, tandem duplications are widely studied in computational biology.