Each of us has enough DNA to reach from here to the sun and ... Another clue came from chemically cross-linking (i.e., joining) histones in chromatin (Thomas & Kornberg, 1975).

For DNA to replicate, the helix must first unwind and break the DNA from a double strand into two single strands. Credit: Taha Shahid et al Upon binding, helicases melt the DNA, breaking the ...