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Definition of Hetero-

Hetero-: Prefix meaning different, as in heteromorphism (something that is different in form) and heterozygous (possessing two different forms of a particular gene). The opposite of hetero- is homo-.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=3735
Last Editorial Review: 3/19/2012

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