Electron microscopic images of (a) and (b), bacteriophage pf16 in non-contracted and contracted forms respectively, and (c) and (d) bacteriophage phiPMW. MagillDamian J. N. KrylovVictor V. ShaburovaOlga W. McGrathJohn C. R. AllenChristopher QuinnJohn P. A. KulakovLeonid 2017 <p>Scale bar corresponds to 100 nm.</p>