And these cells carry out these biochemical processes. And many of these biochemical processes exist in every single cell of our body. For instance, glycolysis takes place in every single cell of our body. Now, we know that we have many different types of cells and many different types of tissues. And what that means means is these different types of cells, even though they carry out the same type of process for instant glycolysis, the requirements for those biochemical processes in the different types of cells actually might be different. And so what that means is our cells must also be able to closely regulate these biochemical processes and fine tune those regulatory pathways to actually meet the needs and demands of those specific types of cells.