Perception

discusses the characterization of the products of these newly isolated oncogenes. Each of these reviews concludes by examining the directions for future experiments; the subsequent article then often describes that research. The series of four articles permits the reader to get a sense of the length of time, the number of researchers, and the huge effort necessary to make significant advances. The book is written at a level which can be understood by anyone with some background in biology. It assumes very little, and most articles are self-explanatory. As