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Definition of Prokaryote

Prokaryote: An organism whose cells lack a discrete nucleus and other special subcellular compartments. Bacteria and viruses are prokaryotes. Humans are not prokaryotes, but rather eukaryotes.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5062
Last Editorial Review: 3/19/2012

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