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Morphological changes of THP-1 and A549 cells after Streptococcus pneumoniae (SP) infection. THP-1 and A549 cells began to die after infection at 4 to 8 hours: A) THP-1 at 0 hours; B) THP-1 at 4 hours; C) THP-1 at 8 hours; D) A549 at 0 hours; E) A549 at 4 hours; F), A549 at 8 hours. (×200).
