Glycerate 3 - phosphate ( GP ) or 3 - phosphoglycerate ( 3PG ) is a 3 - carbon molecule that is a metabolic intermediate in both glycolysis and the Calvin cycle .
Glycerate 3 - phosphate ( GP ) or 3 - phosphoglycerate ( 3PG ) . 
 This 3 - carbon molecule is a metabolic intermediate in both glycolysis and the Calvin cycle .