The National Center for Biotechnology Information (NCBI) does a number of educational outreach programs, and their tutorials come highly recommended. In the "Web Tutorials" area, visitors will find nine different resources that cover DNA manipulation and the identification of disease genes. A good portion of these materials are collected from publications. Publications include "Comparative Genomics" and other documents, and they are available in their entirety via the "Bookshelf" section of the site. Moving on, the detailed "Problem Sets" are taken from other NCBI publications, and they cover disease genes and 3D protein structures. Finally, the "Video Tutorials" section of the site offers tutorials on how to quickly obtain specific materials from the NCBI website and PubMed.