Young's seminormal form and simple modules for $S_n$ in characteristic   $p$
  We realize the integral Specht modules for the symmetric group $S_n$ as induced modules from the subalgebra of the group algebra generated by the Jucys-Murphy elements. We deduce from this that the simple modules for $FS_n$ are generated by reductions modulo $p$ of the corresponding Jucys-Murphy idempotents. 
Steen Ryom-Hansen
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