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The proteolysis of αII-spectrin by calpain may be physiologically involved with synaptic remodeling, long-term potentiation, and memory formation. Calpain activation may also mediate neuronal apoptosis, responses to hypoxic insult, and excitotoxic injury. Surprisingly little is known of the activity of these calpain-mediated processes in the adult human brain. Using an antibody that specifically recognizes...