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Dependence of the MSP1a molecular mass upon the number of tandem repeats. The predicted (squares) and observed (triangles) molecular masses of recombinant MSP1a from different A. marginale isolates expressed in E. coli were calculated from the reported amino acid sequence or estimated from the electrophoretic mobility, respectively. The intercept indicates the molecular mass of the conserved C-terminal region and the slope the average molecular mass of a single repeat.
