the chromatin template activity of the polytene chromosomes in larval salivary glands of drosophila hydei has been assayed by in situ transcription , on the fixed chromatin using e. coli rna polymerase holoenzyme and 3h-utp as the monitoring substrate , both with optimal salt and high salt concentration ( 1 m nacl ) .
C0040649
transcription
C0035681
rna polymerase