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Learning performance of aged rats in the water-maze: correlation with PREG S levels in the hippocampus. PREG S concentrations were expressed in log (ng/g). The performance was expressed as the mean distance to reach the hidden platform during the last four days of the test. Low PREG S levels were linked with longer distances, i.e., worse performances [y = (−7.01 ± 2.18)x + 12.61].
