To further demonstrate that the base distribution in these gene sequences are non-random, and generally true for conserved gene sequences, we have generated graphical representations of several conserved genes, a selection of which are shown in Fig. 4 . Plots of several alpha globin genes are included here to show that there is shape similarity between the same genes from different species indicating that entire gene sequences inclusive of introns and exons have close similarities. This can also be seen in the plots of several histones, tubulins and heat shock proteins, of which some representative samples are given in Figs. 4 and 5.