Energy and Metabolism

ID #1775

IIt's confusing looking at the diagram of glycolysis. I don't understand where the "extra" phosphates come from. If only two were originally invested, how do we get four ATP at then end ie: glyceraldehyde-3-phosphate is converted to 1,3-Bisphosphate without any obvious input of inorganic phosphate. How does this happen without the use of more ATP.

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