You are studying a pathogenic bacterium which secretes a toxin that affects G protein receptor signaling. You perform a preliminary experiment in which you examine intracellular CAMP levels in untreated and toxin treated cells. The data is in the figure below. How does the toxin affect CAMP levels due to G protein receptor signaling?

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.