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Insertion success rate (mean ± standard error of the mean) of carbon fiber arrays in agarose without PEG (black, n=91 fibers), an explanted rat brain without PEG (blue, n=70 fibers), and an explanted rat brain with PEG coating (red, n=22 fibers). PEG coating enabled a 100% insertion success rate regardless of length or insertion medium, whereas non-PEG coated arrays suffered from a low success rate at lengths longer than 2 mm.
