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. 2012 Jan 23;7(1):e30499. doi: 10.1371/journal.pone.0030499

Figure 3. Evidence that stdA, stdB, stdC, stdD, stdE, and stdF constitute a polycistronic transcriptional unit.

Figure 3

A. Diagram of the std operon. Opposite arrows below the diagram represent primer pairs used to examine co-transcription of contiguous coding sequences. B. Co-transcription of contiguous coding sequences in the std operon. PCR fragments generated with primer pairs specific for contiguous coding sequences were resolved in a 2% agarose gel, stained with ethidium bromide, and visualized with UV light. The 1 kb+ DNA ladder (Innovaplex, Sugar Land, TX) was used as size marker.