Figure 11.16 trc promoter lacO S/D lacl Polylinker (cloning site) T1 T2 Ampicillin Origin of resistance DNA replication Genetic map of the 2012 Pearson Education,Inc. expression vector pSE420.Figure 11.16 Ampicillin Origin of resistance DNA replication Polylinker (cloning site) S/D T1 T2 trc promoter lacO lacI © 2012 Pearson Education, Inc. Genetic map of the expression vector pSE420