SNRNP70 and connective tissue disorder: Serum Connective Tissue Diseases screen: Negative (tested for U1RNP, SS-ARo (60 kDa, 52 kDa), SS-B/La, Centromere B, Scl-70, Jo-1, Fibrillarin, RNA Pol III, Rib-P, PM-Scl, and PCNA, Mi-2 proteins and Sm proteins and dsDNA).