ABNER web service is a Named entity recognition system for molecular biology text analysis. It uses linear - chain conditional random fields ( CRFs ) with a variety of orthographic and contextual features. Sentence Protein DNA RNA Cell Line Cell Type B. Settles (2005) . ABNER: an open source tool for automatically tagging genes, proteins, and other entity names in text . Bioinformatics, 21(14) :3191 -3192.