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a Cellular uptake experiments of Gd-LP, P1-Gd-LP, P2-Gd-LP, P3-Gd-LP, and P2/P3-Gd-LP in A549 cells and HUVECs. b-d Cellular competition study of P1-Gd-LP, P2-Gd-LP, and P3-Gd-LP, with P1, P2, and P3 respectively added to inhibit receptors in the competition groups. *P < 0.05, vs the other groups
