So ribosomes that are found in the cytosol, which is region number 14, it's this clear region shown on the entire cell. So we have ribosomes that are found in a cytosol and which are not bound to any type of membrane, are called free ribosomes. And they function to also synthesize protein. But these proteins synthesized by the free ribosomes end up staying within our cytosol. So that's the main difference between the ribosomes found inside the rough and the plasma reticulum and the free ribosomes, the ribosomes in the Er basically create proteins that either leave that cell or end up being in the cell membrane. However, the proteins created by the free ribosomes stay in the cytosol.