For a deeper primer on what peptides are and how they act, see what do peptides do, are peptides safe and are peptides steroids
Faisal M, Saquib Q, Alatar AA, Al-Khedhairy AA, Hegazy AK, Musarrat J (2013) Phytotoxic hazards of NiO-nanoparticles in tomato: a study on mechanism of cell death
10.1016/0896-6273(88)90162-6 Neuron 24 ChuZ.HablitzJ
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In conclusion, targeting specific transport processes in the brain vasculature, tailoring and modulating the mechanisms by which NPs may cross the BBB and reach a specific brain area, may enhance drug transport through the BBB together with its therapeutic efficacy