Donna R. Maglott James Ostell Kim D. Pruitt Tatiana A. Tatusova Entrez Gene: gene-centered information at NCBI. 26-31 2007 35 Nucleic Acids Research Database-Issue http://dx.doi.org/10.1093/nar/gkl993 db/journals/nar/nar35.html#MaglottOPT07