Co-transcription analysis of the genes in the local chromosomal region surrounding preA. (A-D) The sets of genes examined are described above the ethidium bromide stained gels. The lane assignments in each set: (1) chromosomal DNA as a template; (2) cDNA as a template; (3) cDNA as a template, no reverse transcriptase. (E) A graphic representation of the preA-linked genes and the primers used for RT-PCR. The sequences for the primers can be found in Table 1.