UK PubMed Central

UK PubMed Central (UKPMC) is a subject repository developed by the European Bioinformatics Institute, The University of Manchester, and the British Library. UKPMC offers free access to biomedical literature resources including: PubMed abstracts (about 22 million); UKPMC full text articles (about 2.2 million, of which over 400,000 are Open Access); Patent abstracts (over 4 million European, US, and International); National Health Service (NHS) clinical guidelines; etc.