Myasthenic Syndrome, Congenital, 4b, Fast-Channel, also known as congenital myasthenic syndrome 4b, is related to brain angioma and myasthenic syndrome, congenital, 4a, slow-channel. An important gene associated with Myasthenic Syndrome, Congenital, 4b, Fast-Channel is CHRNE (Cholinergic Receptor Nicotinic Epsilon Subunit), and among its related pathways/superpathways are Nanog in Mammalian ESC Pluripotency and Acetylcholine binding and downstream events. Affiliated tissues include skeletal muscle, and related phenotypes are ophthalmoplegia and weakness of facial musculature