DNA chip technology is an improved and highly scaled-up version of
a 25 year old method to reveal very small changes in several hundreds or even
thousands of genes in one step rather than searching one gene at a time. This
technique can also estimate the activity of many genes. This way one can see
what genes are doing inside the cells, or seeing genes in action. The outcome of
this method is can be used in pattern recognition problems in bioinformatics.
