en.wikipedia.org
en.wikipedia.org
ncbi.nlm.nih.gov
National Center for Biotechnology Information
https://www.ncbi.nlm.nih.gov › books › NBK26876
nature.com
pmc.ncbi.nlm.nih.gov
pmc.ncbi.nlm.nih.gov
https://pmc.ncbi.nlm.nih.gov › articles › PMC3331698
byjus.com
earth.com
news-medical.net
nature.com
sciencedaily.com
nobelprize.org
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