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Zeta potential (filled circle) and particle size (filled diamond) at varying weight ratios of CS/siRNA complexes formulated with CS-Asp of different MW (20, 45, 200, and 460 kDa). a CS-Asp 20 kDa; b CS-Asp 45 kDa; c CS-Asp 200 kDa; d CS-Asp 460 kDa. Each value represents the mean ± SD of three measurements
