Contrary to our expectation, the percentages of CD45RA-negative cells in fresh CD8+ lymphocytes of the PL and MM groups were significantly higher than those of HV (mean ± S.D., 63.4 ± 19.5, 61.7 ± 10.0, and 46.5 ± 8.0, resp). Here, CD8A is linked to Miyoshi myopathy.