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Purification and identification of the avipoxvirus 282E4. (A) Electron microscopy of purified virions using negative phosphotungstic acid staining, the bar is 200 nm; (b) PCR amplification of avipoxvirus 282E4. M-DL2000 DNA Marker; Lane 1, PCR products of FWPV using P4b primers; Lane 2, negative control.
