Transcytosis lipid bilayer animation video. Transcytosis is a cellular mechanism that transports various macromolecules across the interior of a cell. Macromolecules are captured in vesicles on one side of the cell, drawn across the cell, and ejected on the other side. This intracellular vesicular traffic is also known as cytopempsis. Transcytosis videos for download from medical vfx experts Polymime Animation Studio.