The biotin-labeled Qdot® 655 nanocrystals are available for detecting streptavidin probes or for creating noncovalent conjugates with streptavidin-labeled molecules or with other biotinylated molecules using a streptavidin bridge. The product is provided as 250 µL of a 2 µM solution and includes 30 mL of Qdot® incubation buffer.