FIG. 4.

Examination of differentially expressed swp1 and swp2 transcripts by RT-PCR. RT-PCR was performed using mRNA isolated 12, 24, and 72 h postinfection and primers specific for E. intestinalis beta-tubulin, swp1, or swp2. The data are presented as an inverse image of an ethidium bromide-stained gel following equal-volume loading and electrophoresis of the products. Control PCR without RT yielded no products.