A computational analysis of the genomes of the papaya, poplar, grape, and a small flowering plant called Arabidopsis thaliana, has identified hundreds of 100-million-year-old non-coding DNA sequences shared between these plants. These conserved non-coding sequences, discovered by an international group of biologists, are not genes, but are located in the promoters upstream of genes and are around 100 DNA base pairs in length. As the papaya, poplar,...
