RNASE3 and systemic lupus erythematosus: ECP was also determined to be enriched in SLE T cells by proteomics analysis (Supplementary Figure 2A, available on the Arthritis & Rheumatology website at http://onlinelibrary.wiley.com/doi/10.1002/art.41920/abstract), whereas soluble ECP levels were not increased in the sera of SLE patients (Supplementary Figure 2B).