the 5 ' end of the in-vitro-transcribed ig mu rna maps exactly to the same position as the 5 ' end of the corresponding in vivo mrna and its formation was sensitive to the addition of low levels of alpha-amanitin ( 1 microgram/ml ) , indicating transcription by rna polymerase ii .
C0040649
transcription
C0035679
rna polymerase ii