Cell Signalling in Mammalian Cells

In the lab of michael ellowitts, who's at california instituteed technology, in the cell engineering a department. They set up this oxen bas system and then applied it in to malin cells. The idea here is to extend this to, i mean, a engineering a seltherapies that will allow, for e, let's say you have a carte targeting a cancer. You could have a system where the cells are distributed widely, but once they target the cancer and reach a certain threshold or quorum a that then they will turn on their therapeutic activity.