in the early period of cellular infection by adenovirus 2 , the e2a region gives rise to 2 major mrna species of 2.0 and 2.3 kilobases , formed by alternative excisions of intron 2 ( gattoni et al. , 1986 , j. mol . biol . 187 , 379-307 ) .
C0007634
cellular
C0021920
intron