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Comparison of the essential and accessory domain in preS1. Essential (green) and accessory (reddish) domains are compared among the hepadnaviruses from primates, rodents, bats and shrews. The first amino acid “M” for genotypes A to H is at amino acid position 12 based on preS1 protein. The exception of genotype D, for which PreS1 is 11 amino acids shorter. The viruses documented in this study are shown in bold.
