Donna R. Maglott James Ostell Kim D. Pruitt Tatiana A. Tatusova Entrez Gene: gene-centered information at NCBI. 52-57 2011 39 Nucleic Acids Research Database-Issue http://dx.doi.org/10.1093/nar/gkq1237 db/journals/nar/nar39.html#MaglottOPT11