(A) z-Stack images of NMJs from phosphate-buffered saline (PBS)–injected control mice, healthy Ig-injected mice, and patient Ig-injected mice. Scale bars 10 μm. (B–E) Quantitative analysis of data. (B) Increased fragments of AChR clusters in patient Ig-injected mice, not in healthy Ig-injected mice, compared with PBS-injected control mice. (C) Reduced AChR area per NMJ in patient Ig-injected mice, not in healthy Ig-injected mice, compared with PBS-injected control mice. (D) Decreased AChR intensity in patient Ig-injected mice, not in healthy Ig-injected mice, compared with PBS-injected control mice. (E) Reduced overlap area of neurofilament-L/synapsin-1 and AChR staining in patient Ig-injected mice, not in healthy Ig-injected mice, compared with PBS-injected control mice. n = 3 mice per group. **p < 0.01.