Enterobacteria phage T4 is a bacteriophage that infects E. coli bacteria. Its DNA is 169-170 kbp long, and is held in an icosahedral head. T4 is a relatively large phage, at approximately 90 nm wide and 200 nm long (most phages range from 25 to 200 nm in length). Its tail fibres allow attachment to a host cell, and the T4’s tail is hollow so that it can pass its nucleic acid to the cell it is infecting during attachment. T4 is only capable of undergoing a lytic lifecycle and not the lysogenic life cycle.
(From Wikipedia, April 25, 2010)
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