The internal head protein Gp16 controls DNA ejection from the bacteriophage T7 virion.

Abstract excerpt

A wild-type T7 virion ejects about 850 bp of the 40 kb genome into the bacterial cell by a transcription-independent process. Internalization of the remainder of the genome normally requires transcription. Inhibition of transcription-independent DNA translocation beyond the leading 850 bp is not absolute but the time taken by a population of phage genomes in overcoming the block averages about 20 minutes at 30...

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