PubMed comprises more than 23 million citations for biomedical literature from MEDLINE, life science journals in PubMed Central, and online books. It is a free resource developed and maintained by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM).
SciVerse Scopus is the largest abstract and citation database of peer-reviewed literature and is published by Elsevier B.V. This means that the research you publish with Biology is now more visible than ever. Biology is an international open access journal of biological sciences. It publishes reviews, research papers and communications in all areas of biology and at the interface of related disciplines.