They also obtained RNA from peripheral blood mononucleocytes from 14 FSHD and 14 control donors, and although none of the five gene sets discriminated FSDH from control blood (14 + 14), the PAX7 score showed a correlation between TIRM− muscle and blood, therefore, they refined the 601 genes that comprise the PAX7 score (311 up and 290 down), to a smaller set of 143 genes (64 up and 79 down) based on individual correlations to disease severity in the donors. This evidence concerns the gene PAX7 and facioscapulohumeral muscular dystrophy.