A microplate enzyme-linked immunosorbent assay (microELISA) for the study of immunochemical relationships between rabbit myosin light chains is described. Purified individual fast-muscle myosin light chains (LC1F, LC2F and LC3F) and their respective antisera, obtained in chicken, were used. Optimal conditions for antigen concentration, antiserum dilution, substrate concentration, incubation time and reproducibility with time were established. The observed cross-reactivities between the different types of light chains associated with rabbit fast-muscle myosin confirm and extend previous results obtained by other authors using radioimmunoassay procedures. It was concluded that microELISA may be successfully employed also to the study of macromolecule cross-reactivities.
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