The emphasis of this book is on the graphic representation of information-containing sequences in biology - such as DNA and amino acids - in order to help the human analyst find interesting patterns. A broad range of topics are considered. Recent proposals to sequence the entire 3-billion base sequence of the human genome, recent advances in understanding viral sequences that induce cancer, and in understanding the mechanisms by which oncogenes are activated in tumours, and recent improved gene mapping techniques (with accompanying proliferation of sequence data) should ensure that this text is of interest to a wide range of readers.