Phospho(Ser240/244)/Total S6RP Whole Cell Lysate Kit 5 plates. Species: Human, Mouse, Rat. *** Please note: MSD has transitioned this product to a status of “made-to-order” with a MINIMUM order size of 25 plates. For an order of the 5-plate pack size, the minimum quantity is 5 packs (25 plates). The 1-plate and 20-plate pack sizes have been discontinued. For Research Use Only. Not for use in diagnostic procedures.