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Family/genus Type Min length Max length
Caulimoviridae Circular 7.2 kb 8.3 kb
Hepadnaviridae Circular 3 kb 3.3 kb
Pseudoviridae Linear 5.1 kb 5.9 kb
Metaviridae Linear 4.9 kb 7.5 kb
Retroviridae Linear 7 kb 11 kb