english: In the center, we have a porous, flexible membrane on which we can add human cells from, say, our lungs, and then underneath, they had capillary cells, the cells in our blood vessels.
non_english: U sredini, imamo poroznu, fleksibilnu membranu na koju dodajemo ljudske ćelije iz, na primer, pluća, a onda ispod, imamo kapilarne ćelije, ćelije naših krvnih sudova.