Stem cells can give rise to specialized cells. When unspecialized stem cells give rise to specialized cells, the process is called differentiation. While differentiating, the cell usually goes through several stages, becoming more specialized at each step. Scientists are just beginning to understand the signals inside and outside cells that trigger each step of the differentiation process.
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Answer:
They can be regulated by different enzymes and feedback.
Explanation:
Most of the transduction pathways are regulated by second messengers and final products. There can be some receptors inside the cell that perceive the excess of some molecules, like Calcium, for example, which can inhibit some signaling pathways, and that's why it's called a third messenger.
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This is somewhat true, but we do have disease and pestilence. overall i would say true.