English to Russian Other Medical (general)

The HBsAg gene is one long open reading frame that contains three in frame
"start" (ATG) codons that divide the gene into three sections, pre-S1, pre-S2, and
S. Because of the multiple start codons, polypeptides of three different sizes
called large, middle, and small (pre-S1 + pre-S2 + S, pre-S2 + S, or S) can be
produced by the same gene