1. A basic local alignment search tool;Altschul;J. Mol. Biol,1990
2. Protein database searches for multiple alignments;Altschul,1990
3. Protein Sequence Database;Barker,1990
4. Flexible protein sequence patterns. A sensitive method to detect weak structural similarities;Barton;J. Mol. Biol,1990
5. Improved sensitivity of biological sequence database searches;Brutlag;CABIOS,1990