Transmission electron micrograph of phage ϕpp2 particles with several structural proteins. The phage particles were purified with three times of centrifugations by PEG-NaCl precipitation method mentioned in the Material section. Virion particles were negatively stained with uranyl acetate for EM. The bars represent a length of 100 nm.
Lin and Lin BMC Genomics 2012 13:224 doi:10.1186/1471-2164-13-224