E-519 by Applied Biological Materials is the complete Retro-Easy-His™ retrovirus expression system (1 Kit) for stable delivery and expression of His-tagged transgenes in dividing mammalian cells. Includes pRetro-E2-His vector (same as E-517) with 6× His tag for Ni-NTA purification and anti-His detection. Use with Pack-Easy Cells (E-511). Store at −20°C.