The use of antisense oligonucleotides (AONs) is a promising therapeutic strategy for central nervous system disorders. However, the delivery of AONs to the central nervous system is challenging because their size does not allow them to diffuse over the blood–brain barrier (BBB) when injected systemically. The BBB can be bypassed by administering directly into the brain. Here we describe a method to perform single and repeated intracerebroventricular injections into the lateral ventricle of the mouse brain.

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