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polytene chromosome puffing definition: The decondensing (loosening) and swelling of the chromosomal sites of target genes on polytene chromosomes following response to a stimulus, to facilitate sudden bursts of transcriptional activity in response to transient environmental signals. [GOC:bf, PMID:12543962]
ecdysone-mediated polytene chromosome puffing definition: The decondensing (loosening) and swelling of the chromosomal sites of hormone-responsive genes on polytene chromosomes in response to increased production of the steroid hormone 20-hydroxyecdysone (ecdysone) in Drosophila larvae approaching pupation. [GOC:bf, PMID:12543962]
heat shock-mediated polytene chromosome puffing definition: The decondensing (loosening) and swelling of the chromosomal sites of heat shock genes on polytene chromosomes in response to a heat shock stimulus. [GOC:bf, PMID:12543962]