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Stem cells and DNA organisation, Embryonic stem cells are usually taken…

- - - - Diploid cell is produced
        
        Cell is cultured until it reaches blastocyst
        
        Stem cells are harvested, cultured and induced to specialise
- - - - Found after zygote undergoes 3 cell divisions (8 cells)
  - - - Found at blastocyst stage where there is an outer layer of placental cells and an inner layer of 50 or so stem cells
  - - - Found in bone marrow and organs (but in organs it's hard to isolate)
- - - - 30nm: chromatin fibre (11nm strand is basically in a loopty loop)
        
        300nm: protein scaffoling, where the fibre is now condesned and looking like a rollercoaster ride with no loops
        
        700nm: protein folds, basically a repeat of 300nm but the scaffolding itself is on a ride
        
        1400nm: chromosome!