The hormone insulin is critical in the delivery of glucose to the cells, essentially providing a pathway for the sugar through the cell wall. In a healthy body, insulin is always in harmonic counterbalance to glucose: Too little insulin is associated with too much blood sugar, and too much insulin with too little blood sugar.

In this model, carbon atoms are dark gray, hydrogen atoms are white, nitrogen atoms are blue, sulfur atoms are yellow, and oxygen atoms are red.

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