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Scanning electron micrographs (SEM, scale bar 20 μm) of MP-Ab2 bound to immobilized PSA on SPR sensor surface: (A) 67.4 nM Ab2 for MP-Ab2 binding PSA after 360 s of association time; (B) after 360 s dissociation of bound 67.4 nM MP-Ab2 on PSA surface; C) size distributions from dynamic light scattering of MP-anti-PSA dispersed in PBS-T pH 7.0. Similar size distributions are found for underivatized particles (See SI, Figs. S6, S7, and S8).
