And so what we're going to do is we're going to discuss four different cases that can exist within a given, given cell of our body. So let's begin with case number one. So in case number one, we're basically assuming that our cells need NADPH molecules as much as they actually need ribosphy phosphate molecules. Now before we discuss this any further, let's actually remember what our cells use NADPH for and what our cells use the ribose phyphosphate molecule for. Well, the NADPH molecule is a very important reducing agent that our cell uses for a variety of different types of bisynthetic processes and detoxification processes. For instance, our cells can use NADPH for processes such as fatty acid synthesis, cholesterol synthesis, neurotransmitter synthesis and nucleotide synthesis.