So let's move on to actually discuss what the structure of this gap junction is. So notice we have these two individual structures which are connected end to end inside that intercellular space. So each of these structures is known as a hemichannel or a connection. And we see that a single gap junction consists of these two hemichannels, also known as connections that are connected end to end to basically form this single gap junction. Now, if we examine each one of these hemichannels, each one of these hemichannels actually consist of six individual polypeptide chains we call connections. And these connections are basically formed to form a hexamer, which basically means we have six individual units within that hemichannel.