Magnetic-TUBEs facilitate convenient "one-step" pull-down of polyubiquitinated proteins. APPLICATIONS. BENEFITS . COMPONENTS . Size: 1ml of slurry, 100 ul slurry is recommended for 1-2 mg of total cell lysate pull down. Storage: Please keep the magnetic TUBE at 4°C. Do not centrifuge, dry or freeze the beads. ADDITIONAL ITEMS REQUIRED.