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(a) Changes in hydrodynamic diameter of PINCs over 1 month in DI water; (b) TEM images of PINCs after 1 month in DI water; (c) TEM images of PINCs after 48 hours in 50% (v/v) FBS. Top: low magnification: Scale bars: 500 nm; Bottom: high magnification: Scale bars: 50 nm.
