label: congenital myasthenic syndrome 4B
label_lc: congenital myasthenic syndrome 4b
description: A congenital myasthenic syndrome characterized by autosomal recessive inheritance of postsynaptic neuromuscular junction defects, early-onset progressive muscle weakness, and kinetic abnormalities of the AChR channel that has material basis in homozygous or compound heterozygous mutation in the CHRNE gene on chromosome 17p13.