Given the task definition, example input & output, solve the new input case.
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.
Example: HeLa cells were first treated with 250 mug / ml Trail followed by pulse labeling of newly synthesized proteins with [ 35S ] methionine.
Output: HeLa cells
HeLa cells are the first immortal human cell line. It should be tagged.

New input case for you:  PAR - 1 and P2Y12 cross - react in platelet activation , and Galphaq and Galphai - coupled receptors are involved in this process .
Output:
platelet