Brain cells are able to absorb glucose independent of insulin. What must be missing from brain cells compared to most other cell types? One of the risks of diabetes mellitus is diabetic coma, which results when insufficient glucose is available to the brain. Would you expect diabetic coma to be triggered when insulin is low or high? Explain. (Hint: Think about regulation of the number of glucose transporters in brain cells and how the hyperglycemia present prior to insulin treatment may affect transporters.)