Streptavidin, Alkaline Phosphatase, 1 ml. Avidin and streptavidin reagents are powerful tools to detect or purify biotinylated proteins, nucleic acids, and other macromolecules. Vector Laboratories enzyme-conjugated avidin and streptavidin are produced with the highest specific activity enzymes in optimal ratios. Specific covalent linkages are chosen to provide stable, highly active conjugates. These enzyme conjugates are suitable for use in solid-phase assays, tissue/cell staining systems, and blotting applications.