To prepare the Mini Extruder, place filter supports in the middle of the rubber o-rings on the plastic cylinders. Deposit ~15 μL phosphate buffered saline on each support and use the pipette tip to move buffer around so each support is fully wet. Place the 100nm filter membrane on one of the supports, making sure it's secure with the phosphate buffered saline. Place the cylinder with the filter 3/4 of the way into the metal cylinder, place the other cylinder on top, sandwiching the membrane filter between the filter supports. Allow the cylinders to rest fully in the metal cylinder, then screw on the metal nut. Use one of the extruder syringes to measure out at least 300 μL of 1.2 (0.3) mg/mL DLPC 0.5 (0.0025) mol% Rho-PE solution and stick the syringe into one end of the just-assembled filter apparatus. Stick the other extruder syringe into the other end of the filter apparatus. Push the DLPC solution back and forth 21 times, ending in the syringe that was empty to begin with. Note that some solution will be lost during the extrusion process.