So what differentiates these two cells or any two specialized cells for that matter is the presence of different types of structures and components inside those cells. So it's those components that give these specialized cells their specific and unique characteristics. Now, all these different components are actually either formed by proteins or they are composed of proteins. And proteins come from DNA. So remember, inside the DNA we have genes and the genes actually code for the proteins. So what differentiates pathway one from pathway two is the type of genes that are expressed and the type of proteins that are formed.