KEGG (Kyoto Encyclopedia of Genes and Genomes) is a bioinformatics resource for linking genomes to life and the environment. It has information on virtually every known topic in molecular biology, and has numerous links to other databases as well.
As the nation’s health protection agency, CDC saves lives and protects people from health, safety, and security threats. I used this website to look up information on rabies, as well as other diseases to compare it to.
A portal to gene-specific content based on NCBI's RefSeq project, information from model organism databases, and links to other resources. I use this to get information about important genes that show up in my papers.