Real image of DNA molecules being copied in human cells, visualized by immunofluorescence microscopy. The yellow arrows mark where replication begins, and the white arrows indicate the direction ...

Each of us has enough DNA to reach from here to ... opening up chromatin fibers and/or removing histones transiently to permit transcription and replication to proceed. Generally speaking, there ...

Histones are a family of basic proteins that associate with DNA in the nucleus and help condense it into chromatin. Nuclear DNA does not appear in free linear strands; it is highly condensed and ...

Chances are you've seen an illustration of DNA's double-helix structure and even pictures of the chromosomes ... The DNA is wrapped around histones -- protein structures that are sometimes ...