Number 92 (Story #1), August 19, 1992 by Phillip F. Schewe and Ben Stein THE LANDSCAPE OF DNA MAY BE FRACTAL . Several studies of DNA reveal unexplained relationships between nucleotides distant from each other. A Rockefeller/Tokyo team of scientists found such correlations in the genes regulating blood coagulation (Europhysics Letters, 7 Feb). Researchers at Boston University transformed sequences of nucleotide into a series of "random walks" and discovered correlations over many scales---1000, 10000, and 100000 nucleotide---suggesting a fractal pattern (Nature, 12 Mar.). Self-similarity on a scale of 50 million nucleotides has showed up in a study at IBM (Phys. Rev. Lett., 22 June). Long-range correlations did not appear in DNA sequences where introns, little-understood intervals of apparently noncoding DNA, were absent, a fact which had frustrated earlier attempts to find correlations in bacterial DNA which did not contain introns. (Science, 7 August 1992.)