... largest subunits of RNA polymerase I, II, and III, respectively; lane I, II, III, a reference serum with anti-RNAP I/ II /III; lane I, III, a reference serum with anti-RNAP I /III; 1 to6, IP with ... RNAP I reactivity with weak RNAP III reactivity and had a strong nucleolar staining that is not always seen in anti-RNAP I /III positive SSc patients [17,18]. In addition,anti-RNAP III levels increased ... 31:38 1-3 83.doi:10.1186/ar3422Cite this article as: Ceribelli et al.: Atypical clinical presentation of a subset of patients with anti -RNA polymerase III - non-scleroderma cases associated with dominant RNA polymerase I reactivity...