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

The doctor wrote that she wanted to distinguish between myasthenia and “another process causing . . . symptoms, like for example motor neuron disorders.”

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

Patients with myasthenia have muscles that tire out much more quickly than normal.

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.