And as we'll see, it actually involves five different proteins. So we know that step one takes place in the mitochondrial matrix, and these remaining steps up until step nine, all take place in a cytoplasm. And so let's begin in a cytoplasm. Let's imagine this is a cytoplasm of our cell. So we have the glucose six phosphate. What happens next is we use a special type of membrane protein found on the membrane of the endoplasm reticulum.