attenuation (a-ten-yu-a´shun)

1. The act of attenuating. 2. Diminution of virulence in a strain of an organism, obtained through selection of variants which occur naturally or through experimental means. 3. Loss of energy of a beam of radiant energy due to absorption, scattering, beam divergence, and other causes as the beam propagates through a medium. 4. Regulation of termination of transcription; involved in control of gene expression in specific tissues.


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