[Lupus Foundation of America LUPUS 21ST CENTURY 2018 CONFERENCE, Abstracts of the Fourth Biannual Scientific Meeting of the North and South American and Caribbean Lupus Community, Armonk, New York, USA, September 13 – 15, 2018 - ()] Auto Antibodies - AA-03 Neuronal-surface P-antigen (NSPA), target of anti-ribosomal P autoantibodies, is expressed in proximal tubule epithelial cells (PTEC): potential role in lupus nephritis