"Figure 1: Chronic THC exposure in old mice can increase the number of connections between neurons in the brain. Brain cells often have structures called ""spines."" Each spine marks a single connection between two brain cells. Compared to young mice (left), neurons in old-mice (middle) tend to have fewer spines. After chronic THC exposure (right), the brain cells of old mice often look more like those of young mice--they have more spines, and therefore more connections to other brain cells."
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