LRP4 and myasthenia gravis: The clinical presentation, treatment response, and disease mechanism differ among MG subgroups, which are classified according to the Abs pattern that includes anti-acetylcholine receptor (AChR), anti-muscle-specific kinase (MuSK) antibodies, low-density lipoprotein receptor-related protein 4 (LRP4) antibodies, and different clinical phenotypes (ocular or generalized) [3,4].