base-pairing


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Two nitrogenous (purine or pyrimidine) bases (adenine and thymine or guanine and cytosine) are held together by weak hydrogen bonds. The number of base pairs is often used as a measure of length of a DNA segment.

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International Union of Immunological SocietiesUniversity of South AfricaInstitute of Infectious Disease and Molecular MedicineElizabeth Glazer Pediatric Aids FoundationStellenbosch University