HPR
Haptoglobin-related protein
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{{medline-entry |title=Development of a microplate ELISA for circulating E-selectin: assay characterization, comparison with a commercial kit, wand establishment of normal reference values. |pubmed-url=https://pubmed.ncbi.nlm.nih.gov/12696081 |abstract=E-selectin, an adhesion molecule, is detectable in the blood. Serum levels of E-selectin can be a prognostic indicator for various malignancies. We developed a microplate enzyme-linked immunosorbent assay (ELISA) for the detection of circulating E-selectin by coating the microwell with monoclonal anti-E-selectin. We incubated the specimen and the biotinylated detecting antibody simultaneously, and used HPR-conjugated streptavidin to generate a signal for quantification. The assay has a sensitivity of 3.8 ng/mL, and the coefficients of variation (CVs) for both within-day and day-to-day precision were all <10%. Our in-house-made kit also compared well with a commercial kit from R