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(A) Optical micrographs of 3D A549 spheroids treated with Dox, PAH6, and Dox-DNA/PAH6 NC, respectively. The scale bar indicates 260 µm. (B) The cytotoxicity of Dox, PAH6, and Dox-DNA/PAH6 NC against 3D A549 spheroids. Error bars represent SD (n = 5).
