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(A,B) A549 cells were preincubated with eRNA (5 μg) and infected with SpΔply pneumococci in the absence or presence of RNase1 (1 and 10 ng). Pneumococcal host-cell adherence to (A) and internalization (B) into A549 cells were tested using antibiotic protection assay. Data represent mean values ± SEM; n = 3; **p ≤ 0.01.
