Chromosome 21
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Chromosome 21 is one of the 23 pairs of chromosomes in humans. Chromosome 21 is both the smallest human autosome and chromosome, with 45 million base pairs representing about 1.5 percent of the total DNA in cells. Wikipedia
Centromere position: Acrocentric; (12.0 Mbp)
Length (bp): 45,090,682 bp; (CHM13)
No. of genes: 215 (CCDS)