To make changes to it or to take out some genes of interest
The neuroendocrine system combines brain actions and and other bodily functions. In the brain, the hypothalamus maintains the balance (homoestasis) which affects other functions of the body such as metabolism, regulating reproduction, utilization of energy, drinking and eating behavior, blood pressure and osmolarity.
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D I guess because grinding optical glass and for polishing metals and has also been made into sandpapers and grinding wheels.