And we'll discuss that in more detail in a different lecture. So this is our mitochondria. It's the power plant of our cell. Now let's move on to our Lysosomes, which are described by these two green vesicles here. So Lysosomes are essentially specialized vesicles that contain hydrolytic enzymes. So that means inside the environment of our Lysosome, we have a relatively low PH, it's about five.