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Fig. 1
The genomic structure of REV. (A) – REV-A strain, (B) – “defective” REV-T strain. LTR – long terminal repeats, U3 and U5 – unique regions, gag – gene encoding viral structural protein, pol – RNA-dependent DNA polymerase and DNA integrase, v-rel – oncogene present only in the defective REV-T strain, β – one thousand base pairs
Fig. 2
Nakanuke syndrome of abnormal featheriness in chickens. Panels (A) and (B). The pictures were taken by A. Mamczur
Fig. 3
Lesions and tumours in the liver of a layer chicken caused by REV infection. The picture was taken by A. Mamczur