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Western blot analysis of 4E9 binding to soluble cCD19 extracellular domain (ECD) and CLBL-1 whole-cell lysates. The arrow points to a single band at 30 kDa for the soluble cCD19 ECD and to bands at ~58 and 61 kDa that correspond to the size of the predicted canine CD19 protein encoded by transcriptional variants.
