So in this case, we separate them based on their isoelectric point, but in this case, we separate them based on their mass, based on their size. So we see that this slab, this band, consists of at least four different proteins, because these four different proteins contain different size values, different masses. Likewise, the second band consists of at least two proteins, the third band consists of at least one, two, three proteins. The fourth band consists of at least three proteins, and the fifth band consists of at least five different proteins. Now, it's not to say that we don't have more proteins here. For example, the reason to say we have at least five proteins in this section is because two proteins that have the same exact isoelectric point can also have the same exact mass.