The PhosphoGRID Saccharomyces cerevisiae protein phosphorylation site database: version 2.0 update. - Ivan Sadowski; Bobby-Joe Breitkreutz; Chris Stark; Ting-Cheng Su; Matthew Dahabieh; Sheetal Raithatha; Wendy Bernhard; Rose Oughtred; Kara Dolinski; Kris Barreto; Mike Tyers (Database J. Biol. Databases Curation, 2013)