This product is similar to biotin-11-dUTP and biotin-16-dUTP except that it has a longer and water-soluble spacer group, which should facilitate interaction between the biotin group and avidin or streptavidin.   Lyophilized solid suitable for long term storage; contains lyophilized TE buffer  Store at -20°C  C33H51N6O21P3SLi4  MW: 1020.54  Biotin-20-dUTP is also available as a 1 mM solution in TE buffer.