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51:34to doing this that are by and large these are the two level levels of epigenetics. The first one is something called methylation effectively as I told you DNA is made up of four distinct nucleotides ATG and C. Now the C the cytosine can sometimes be modified by attaching a methyl group. A methyl group is I think just CH3. You just take a CH3 part of a molecule and you attach it to the to the cytosine. When you do that, if you've got a bunch of cytosine in a segment of DNA that has these methyl groups, the RNA polymerase can't really get to it because you've altered the the look and
52:15the RNA polymerase comes in and it's like, I don't know what I'm looking at. I'm going to go somewhere else. >> I'm I'm going to go somewhere else. >> Right? So, so this is one way to silence parts of the dean, parts of the genetic sequence by just like adding a little chemical tag. And th those are the little tiny um like red pins that you're seeing. Okay? And they only attach crucially to the C the cytosine. Okay? So the A's, T's, and G's are always left alone. Okay? The the part of what we're