Muscular dysgenesis in mutant mice is characterised by failure of excitation-contraction (E-C) coupling and consequent loss of skeletal muscle contraction. Contractile activity is restored in vitro by the addition of normal mice cells (11) (18) (7). In the present study we show a new model: contraction and ultrastructural organization of dysgenic myotubes are restored by coculture with Schwann cells from normal mice.

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