What repeating units do strs contain

As its name implies, an STR contains repeating units of a short (typically three- to four-nucleotide) DNA sequence. The number of repeats within an STR is referred to as an allele. For instance, the STR known as D7S820, found on chromosome 7, contains between 5 and 16 repeats of GATA. (From google) there might be more information there!!

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acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

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