Columbia Biosciences developed and sells two versions of its SureLight™ streptavidin-R-phycoerythrin (SAPE): a high-intensity and standard version. Both products are stable, well-defined and do not require stabilizers. Primary uses of these conjugates include immunoassays, flow cytometry and multiplexing platforms such as Luminex.

• The high-intensity polymeric product is suited for applications where small amounts of antigens are available.
• The standard-intensity product is more suitable for moderate sensitivity assays.