Complex sentence: Variations among cloned RU sequences were associated with the number of microsatellite repeats and lengths of C and G stretches where triple stranded structures are formed, and adjacent to alternating purine and pyrimidine sequences with Z-DNA/stem-loop structures.
Split into simpler sentences: Variations among cloned RU sequences were characterized by the number of microsatellite repeats, and also by the lengths of C and G stretches where triple stranded structures are formed. Other regions of variability were found adjacent to alternating purine and pyrimidine sequences with Z-DNA/stem-loop structures.