In this task, you will be given sentences in which you have to recognize the name of the body cells. A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Although there might be several correct answers, you need to write one of them.

Let me give you an example: HeLa cells were first treated with 250 mug / ml Trail followed by pulse labeling of newly synthesized proteins with [ 35S ] methionine.
The answer to this example can be: HeLa cells
Here is why: HeLa cells are the first immortal human cell line. It should be tagged.

OK. solve this:
 The CSF - 1 receptor exerts its biological effects on cells via a range of signaling proteins including Erk1 / 2 and Akt .
Answer:
cells