FIGURE 1.   Polymerase chain reaction amplification products obtained from the A, mitochondrial large subunit ribosomal RNA (mtlsurRNA) and B, cytochrome B (mtCytB) gene regions from representative triatomine species studied. Lane 1, I kb molecular weight ladder; 2, Rhodnius prolixus; 3, R. robustus; 4, R. neglectus; 5, Psammolestes coreodes; 6, Triatoma infestans; 7, T dimidiata; 8, T protracts; 9, Dipetalogaster maxima; 10, Panstrongylus megistus. In each specimen, a single gene fragment reaction product of approximately 400 basepairs (bp) for the mtlsurRNA gene and approximately 500 hp for the mtCytB gene was obtained.