Microsatellites or simple sequence repeats (SSRs) represent variation in the repeat number of sequences, 1-6 bp long (VNTRs can be as long as 1 kbp), such as (AC)n or (AAC)n, etc. Being smaller in size, SSRs are more common and amenable to PCR analysis (Fig. 40.10), Recently, more then 300 loci representing microsatellites, were mapped each in human and mouse genomes. Similar effort are also being made in several crop plants.
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