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" ... The next step was devising a method for targeting tumors without attacking healthy cells. This is where the nanoparticles enter the picture. Fast-growing tumors create their own blood vessels so they can draw nutrients from the blood stream. The rapid growth of the tumor leads to the formation of flawed blood vessels that have small holes that are approximately 200 nanometeres in size. This leaves the tumor vulnerable to invasion by nanoparticles that are small enough to fit through the holes. ... "