about 3 billion bases
About how many bases (DNA letters) make up human DNA?
The bases A, T, C and G pair up — A with T, C with G — to form base pairs.
Source: MedlinePlus Genetics, U.S. National Library of Medicine (2024) medlineplus.gov
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The Human Genome Project launched in October 1990. When was it completed?

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about 3 billion bases
The bases A, T, C and G pair up — A with T, C with G — to form base pairs.
Source: MedlinePlus Genetics, U.S. National Library of Medicine (2024) medlineplus.gov
92%
It still had fewer than 400 gaps. The June 2000 draft covered 90% but had more than 150,000 unknown stretches.
Source: National Human Genome Research Institute (2022) genome.gov
March 31, 2022
The Telomere-to-Telomere (T2T) consortium filled in the gaps left by the original Human Genome Project.
Source: National Human Genome Research Institute (2022) genome.gov
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