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In page Glycolysis:

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Charges are balanced by the difference between ADP and ATP. In the cellular environment, all three hydroxyl groups of ADP dissociate into −O and H+, giving ADP3−, and this ion tends to exist in an ionic bond with Mg2+, giving ADPMg. ATP behaves identically except that it has four hydroxyl groups, giving ATPMg2−. When these differences along with the true charges on the two phosphate groups are considered together, the net charges of −4 on each side are balanced.[citation needed]