Ubiquitin Multiplex Arrays for Measuring Protein Ubiquitylation Ubiquitin System as a Target for High-Throughput Screening High Throughput Assays for Inhibitors of Ubiquitin Carrier (E2) and Ubiquitin Ligase (E3) Proteins Natural Product Inhibitors Of Specific E3 Ubiquitin Ligases Characterization of Novel Substrates of N-end Rule-Dependent Ubiquitylation Identified through a Proteome-Wide Screen in vitro Screen Discovery Of Skeletrophin A Novel Ubiquitin E3 Ligase Regulator of NF-kappaB From A Genome-wide High Throughput Cell-based Assay P53-MDM2 System as a Target for High-Throughput Screening MDM2 Self-Ubiquitylation: An Example of a High Throughput Assay for Inhibitors of E3 Ligase Activity MSD® MULTI-ARRAY® Polyhistidine Binding Plates Proteome-Wide screen for Substrates of Ubiquitylation using MULTI-ARRAY® Technology