Figure 2

Figure 2

 Acetylcholine receptor (AChR) antibody levels in Chinese patients plotted against Myasthenia Gravis Foundation of America (MGFA) clinical grades at the time of sampling (given as 1–5, corresponding to I–V). Most of the AChR antibody-negative samples were from patients with MGFA grade 1. Some of these patients had had higher grades at maximum severity (table 1).