So we have the guanine and the anine. Notice that the guanine begins on our five carbon and it goes down to our three carbon, while the second single stranded DNA begins with the third carbon and goes down to the fifth carbon. And this type of opposite or reverse arrangement is known as antiparallel. That is, the two single stranded DNA, this one and this one run in the parallel direction, but they run in the opposite direction, meaning that this goes from the five to the three carbon and this runs from the three to the five carbon. So once again, we have our notice that if the first strand runs in the five three direction, then the complementary strand must run in the reverse three to five direction. And this type of arrangement is known as antiparallel.