I, like many on this forum i presume, have been raised to believe that the 30 nm fiber in DNA has the shape of a solenoid, with 6 nucleosomes per turn. However, current research seems to contradict this.
I just bought Harvey Lodish’s "Molecular Cell Biology" 6th edition(it came out in august). It is there where I read that the current model for the 30 nm fiber is not a solenoid, but a sort of zig-zag ribon that is wound into a helix of two "strands" of solenoids, remarcably similar with the structure of a DNA molecule. This helix however, is left handed, not right handed like in a DNA molecule.

Anyone know more?