So in 1958, two individuals, one by the name of Matthew Methleton and the other one by the name of Franklin Stahl, conduct an experiment that became known as the methylsen and style experiment. And what this showed was that the semiconserved replication hypothesis correctly described the way that DNA molecules actually replicated. Now, before we discuss what the experiment looked like, let's actually take a look at what this hypothesis tells us. So based on the semiconserve replication of DNA we have our DNA molecule the original DNA molecule that consists of this double helix that contains two individual strands of DNA that we're going to call the parent strands or the parental strands so we have parental strand number one and it's complementary parental strand number two shown in blue. Now, before replication begins, we have to separate our DNA molecule. And so we separate the two individual strands of DNA and once we separate them, each one of these blue strands, the original parenthal strands, act as a template to synthesize the complementary new strand we're going to call the daughter strand that is shown in green.