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Summary of Clinical and Laboratory Results
| Subject | Clinical Myotonia | Myotonic Discharges | Muscle Biopsy | Heterozygous for G233S Mutation |
|---|---|---|---|---|
| Mother | No | No | N.D. | − |
| Father | Yes | Yes | N.D. | + |
| Sister | No | No | N.D. | − |
| Proband | Yes | Yes | Normal | + |
| Son | Unknown | ND | ND | ND |
