Below are web-based tools for biologists. They are collections of biological analysis tools and useful resources on the web. Some sites are freely accessable but some require registration before use.

Three major international DNA sequence databases maintained by National Center for Biotechnology Information (NCBI), European Bioinformatics Institute (EBI) and DNA Data Bank of Japan (DDBJ).

The field of microarray technology presents a tremedous technical challenge for both acedemic institutions and industry. The following web pages offer a microarray companies and expert institutes.