Tomorrow Analysts estimate that the market for DNA microarrays will be $500 million to $1 billion per year, so, clearly, chips are in demand. In the future, advances in technology should make DNA chips cheaper and easier to make. Several groups of researchers, for example, are developing methods for printing chips using devices similar to an ink-jet printer. Eventually, custom-order chips may be commercially available, just a mouse click away. In the meantime, molecular biologists have teamed up with computer scientists and programmers to come up with ways to make chips easier to read, and the resulting data easier to analyze. Soon scientists will have access to DNA chips containing every gene in mice or humans. With chips in hand, we'll be that much closer to the dream of understanding ourselves-down to the very last base.