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Performance on DR of young and aged OVX+Vehicle (Veh) and OVX+E monkeys. Unlike aged monkeys, young OVX+Veh and young OVX+E rhesus monkeys performed equally well on DR tasks. In addition, the performance of the aged OVX+E group was equivalent to both young treatment groups, with the aged OVX+Veh performing significantly worse than all three other age and treatment groups. Error bars represent SEM.
