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Genome structure characteristics of SHBV. A: ORFs are indicated by colours with polymerase (green), surface protein (cyan), core protein (purple) and X protein (yellow). Numbering starts at the junction of preS1 and preS2 domains in the surface protein. B: Genome features of SHBV. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
