uni 4dUnit 4D: Laboratory techniques and their application. Numerous critical and private pieces of information are kept on file at scientific organisations and workplaces. To protect third parties,The 4D-Nucleofector ® X Unit is one of the four functional modules of the 4D-Nucleofector ® System. It supports Nucleofection of various cell numbers (2 x 10 4 to 2 x 10 7) cells in