the commonly present 1-kb rna is the excised td intron , which exists in both linear and circular forms in the respective t-even-phage-infected cells , while the 0.6-kb rna unique to t4 may be the excised intron derived from the ribonucleotide reductase small subunit gene ( nrdb ) of the phage .
C0007634
cells
C0021920
intron