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\textbf{Figure 7. Antibiotic deliver delivery  to OS cockroaches.} (A) For systemic delivery, a 20 μl aliquot was injected at the base of the 3rd (shown) or 4th tergum on the ventral side of the abdomen. (B) for oral delivery, cockroaches were placed on their back and were fed a solution containing 50\% sucrose and the test antibiotic.