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Bender confirmed her father’s death and said the cause was complications from myasthenia gravis, a neuromuscular disease.

The doctor listened to Emmons’s description of her symptoms and told her he suspected she had myasthenia gravis, a rare neuromuscular condition that causes muscle weakness.

Could it be a different type of autoimmune disease — maybe myasthenia gravis?

He agreed that these symptoms made myasthenia gravis a likely diagnosis.

The deal gives Johnson & Johnson’s Janssen unit access to Momenta’s experimental therapy, nipocalimab, being tested for myasthenia gravis, a neuromuscular disease that causes weakness in muscles.