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Particle characterization of QTPlus‐AM21. A) Particle sizes of empty QTsome Original, QTsome Original‐AM21, empty QTPlus, and QTPlus‐AM21 (n = 3); B) Cryo‐EM image of QTPlus‐AM21; C) 1% Agarose gel electrophoresis of QTPlus‐AM21 with different nitrogen‐to‐phosphate (N/P) ratio.
