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A technical replicate involves the multiple labeling or reciprocal labeling of the same RNA sample. The purpose of a technical replicate is to control for technical variability within an experiment (array to array variation, reagent variation, dye incorporation, etc.) A well run experiment should have minimal variation thus minimizing the need for technical replicates.
A biological replicate involves isolating RNA independently from replicate sources (multiple cell lines, multiple biopsies, multiple patients, etc). The purpose of a biological replicate is to control for biological diversity. Biological replicates are often more telling, and for this reason are ¡°better¡± than technical replicates, however, biological replicates are often more difficult to obtain

[ Last edited by shaquila on 2011-7-19 at 13:47 ]
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