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. 2021 Jan 12:L20-1298. doi: 10.7326/L20-1298

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This article is made available via the PMC Open Access Subset for unrestricted re-use for research, analyses, and text and data mining through PubMed Central. Acknowledgement of the original source shall include a notice similar to the following: "© 2020 American College of Physicians. Some rights reserved. This work permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited." These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure. Relevant clinical and laboratory findings, including the MuSK ab titers in serum samples tested by RIPA and by CBA. One pair of symbols shows the MuSK ab of IgG4, and the other shows the MuSK ab of IgG1–3. ab = antibody; CBA = cell-based assay; IVIG = intravenous immunoglobulin; MG = myasthenia gravis, MuSK = muscle-specific kinase; RIPA = radioimmunoprecipitation assay; SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2. — One pair of symbols shows the MuSK ab of IgG4, and the other shows the MuSK ab of IgG1–3. ab = antibody; CBA = cell-based assay; IVIG = intravenous immunoglobulin; MG = myasthenia gravis, MuSK = muscle-specific kinase; RIPA = radioimmunoprecipitation assay; SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.