Scheme 1From: Magnetic resonance imaging with upconversion nanoprobes capable of crossing the blood-cerebrospinal fluid barrierDesign of ANG-PEG-UCNP for ventriculography. (a) ANG-PEG-UCNP synthesis. (b) Schematic illustration of ANG-PEG-UCNP binding to LRP receptors for B-CSF barrier crossing via LRP receptor-mediated endocytosisBack to article page