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# Long description

Figure 19 Starting at the top left of the diagram, it says: ATP adenosine, horizontal line to a P. Above the P a double line goes up to an O, while below it a single line goes down to an O superscript minus. A line goes to the right from the P to an O, and then on to another P. Above the P a double line goes up to an O, while below it a single line goes down to an O superscript minus. A line goes to the right from the P to an O, and then on to another P. Above the P a double line goes up to an O, while below it a single line goes down to an O superscript minus, and to the right a line goes to a final O superscript minus. The final 'P', with its three Os, is enclosed in a blue shaded box. To the right of the box is an arrow pointing to the right. Above the arrow it says 'to oxygen atom on a glucose molecule'.

Below the first 'O superscript minus' in the structure, there is a downward pointing half headed arrow labelled 'hexokinase'. To the left of this a shorter, upward pointing half headed arrow.

At the bottom of the diagram it says: ADP, adenosine horizontal line to a P. Above the P a double line goes up to an O, while below it a single line goes down to an O superscript minus. A line goes to the right from the P to an O, and then on to another P. Above the P a double line goes up to an O, while below it a single line goes down to an O superscript minus, and to the right a line goes to a final O superscript minus.