I am reading about the Calvin Cycle in Photosynthesis. My book says that the Calvin Cycle constructs a 3 carbon sugar called glyceraldehyde-3-phosphate (G3P) and then it says "You already met G3P in glycolysis. It is the three-carbon sugar formed by the splitting of glucose." So I'm thinking, wait a minute, that's pyruvate. Are G3P and pyruvate two words for the same thing or is there a difference in the molecules? Thanks!