s on a polytene chromosome
in the salivary gland
s of certain insect larva
e which, when present, means that transcription
is taking place. The puffs are areas where the chromosome
has become decondensed for the purpose, and are easily visible with a light microscope
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.