ACE2 and neoplasm: To investigate whether A-MPs adsorb SARS-CoV-2 in an ACE2-dependent manner, we additionally prepared MPs from either ACE2-overexpressing A549 tumor cells (AO-MPs) or ACE2-deficient A549 tumor cells (AD-MPs) (Fig. 1d, e and Supplementary Fig. 1a, b, d).