Hello Mark, you can find beads to standardise your data measuring cells surface antigen molecules in an indirect assay (Antibody Binding Capacity) from Sigma (Quantum Simply cellular microbeads kit- for dos (QSC-20 or or QSC-100) for winlist (QSC-20W or QSC-100W)). From the catalogue looks like that you must buy the whole kit (software included). They are quite expensive. Cheers, Mara Mara Rocchi, International Livestock Resarch Institute Nairobi, Kenya
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