And then DNA polymerase works backwards with respect to direction of the movement of this replication fork. So the replication fork moves this way, this is synthesized this way, but this is synthesized in the opposite direction. And we see that the DNA helicase basically reads the parent strand in the allowed three to five direction and it forms the lagging strand in the five to three direction. So therefore the polymerase forms the lagging strand in a piece wise fashion. So piece by piece in a discontinuous manner and each one of these pieces is known as the Okasagi fragments. Now, this process is important because it basically ensures two important things.