The purpose of this study was to reveal influential journals used by life scientists; journals not currently included in "BIOSIS Previews," but included in either "PubMed" or "Science Citation Index Expanded". These 252 journals were revealed by the Eigenfactor, an iterative ranking scheme which quantitatively measures the scientific influence of academic publications based upon their usage by scholars. This method has allowed us to determine which journals not covered by "BIOSIS Previews" have a notable impact in biology. Such an analysis is important for individual scientists, libraries, professional societies and funding organizations. This analysis illustrates the benefit of searching multiple databases for more accurate article retrieval in biology. (Contains 2 tables.)