N-terminal sequence polymorphisms determine differential secretion of YopP/YopJ proteins. E. BrodskyIgor MedzhitovRuslan 2008 <p>N-terminal 14 amino acids of YopP and YopJ from various <i>Yersinia</i> strains and serotypes. O∶8 serotypes of <i>Y. enterocolitica</i> possess an SP sequence at positions 10 and 11, whereas <i>Y. pseudotuberculosis</i> and <i>Y. pestis</i> possess the IS sequence. O∶9 serotypes of <i>Y. enterocolitica</i> also possess a polymorphism at amino acid 11, which likely accounts for the reduced secretion of YopP by O∶9 serotypes. Ye – <i>Y. enterocolitica</i>, Ype – <i>Y. pestis</i>, Yps – <i>Y. pseudotuberculosis</i>. Ype Med. – <i>Y. pestis</i>, biovar Medievalis.</p>