The complate nucleotide sequences of the cloned preS genes(preS-HZ and preS-LZ,GenBank accession numbers:Af325674 and AF325675 respectively) were 522bp long,encoding 174aa.

• 克隆的HBVpreS基因杭州分离物 (preS HZ)和兰州分离物 (preS LZ)全长 5 2 2个核苷酸 ,编码174个氨基酸。