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In recent years, the stability of biotherapeutics in vivo has received increasing attention. Assessing the stability of biotherapeutics in serum may support the selection of adequate molecule candidates. In our study, we compared the physical stability of 8 different monoclonal antibodies (mAbs) in phosphate-buffered saline (PBS) and human serum. mAbs were Alexa Fluor 488-labeled and characterized with respect to fragmentation, aggregation, and proteinaceous particle formation. Samples were analyzed using size-exclusion chromatography,