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Z-DNA is usually found in areas with alternating purine and pyrimidine bases (ie. -ATATAT- ). When you look at it from the side, Z-DNA zig-zags toward the top left of the page/screen (This is essentially what it means when you read "left-handed helical form"), compared to B-DNA ("right-handed") which spins toward the top right. If you look at the top looking down the center of the molecule, B-DNA has no hole in the center (like in A-DNA) and is arranged with the bases in the middle, then the sugar, and then finally the phosphate backbone is at the edges. Z-DNA also lacks a hole in the center, but due to the zig-zagging structure, there is no definite area to locate the bases, sugar, and phosphate backbone -- they are all jumbled up together.

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