222. PREFERENTIAL BINDING TO AN UNEXPECTED EPITOPE OF A CHIMERIC RECOMBINANT PROTEINASE 3 VARIANT BY ANTI-NEUTROPHIL CYTOPLASMIC ANTIBODIES. (29th March 2019) - Thompson, Gwen; Moura, Marta Casal; Nelson, Darlene; Fussner, Lynn; Hummel, Amber; Jenne, Dieter; Fervenza, Fernando; Hoffman, Gary; Kallenberg, Cees; Langford, Carol; McCune, Joseph; Merkel, Peter; et al.