15 years of PhosphoSitePlus®: integrating post-translationally modified sites, disease variants and isoforms. - Peter V. Hornbeck; Jon M. Kornhauser; Vaughan Latham; Beth Murray; Vidhisha Nandhikonda; Alex S. Nord; Elzbieta Skrzypek; Travis J. Wheeler; Bin Zhang; Florian Gnad (Nucleic Acids Res., 2019)