In the reduction stage, six molecules of 3-PGA are converted into six molecules of which compound?

1. Adenosine triphosphate and NADPH are spent during the second stage of the cycle. 2. They convert the six molecules of 3-PGA into six molecules of glyceraldehyde 3-phosphate. 3. That is a reduction reaction, because it involves the gain of electrons by 3-PGA. 4. Ribulose bisphosphate is rebuilt only in the third stage, so it cannot be the product here. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.3 Using Light Energy to Make Organic Molecules_