Retinol binding protein ELISA kits are assays designed to detect the 21-kDa carrier protein known as retinol binding protein. It binds retinol and is involved in the transport of vitamin A from the liver to other tissues in the body. Retinol binding proteins have been seen in the uterus and embryonic tissues, as retinol and retinoic acid play a role in embryonic development. Retinol binding protein 4 (RBP4) has been associated with type 2 diabetes and cardiovascular diseases. Visit the supplier page for more information about detection target, range and reactivity.