memory retention test. (A) Design of the test: animals crossed a rotating pole at 0, 3 or 10 rpm either to the right or to the left. At the end of the pole the rat were allowed to find a hidden entrance and the successfull (1) or failed (0) entries noted. (B) Scores of rats subjected to ischemia and treated either with saline (n = 7) or EPO (n = 7) for 3 days. Mann–Whitney test, individual significances are shown in the Figure. Abbreviations: l –left, r – right, sal – saline, sign - significance.