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(A) X-irradiated animals receiving saline injections begin to pattern late (blocks 21–24). (B) Amphetamine (0.3 mg/kg) restores PSA in x-irradiated animals to the level of sham-treated animals. They start patterning as early as block 16. Sham-irradiated animals receiving saline (C) and sham-irradiated animals receiving d-amphetamine (D) also pattern much earlier than x-irradiated animals receiving saline. These groups also show PSA as early as block 16.
