And in the same exact analogous way, the template DNA strand is that architect that provides the blueprint, the instructions to actually build the structure that polynucleotide chain. So DNA polymerase obtains its instructions from the preexisting DNA template that is found in that double helical structure. So remember, in that double helix we have two of these template strands that basically run in an anti parallel direction. And when we replicate DNA molecules, those two strands essentially separate. And when they separate, we can use DNA polymerase can use those templates to synthesize those new replicated polynucleotide chains. So the DNA polymerase can only add new nucleotides onto that growing polypeptide chain as long as the new nucleotides are complementary to the basis down on that template DNA molecule.