PRKCG and Autoimmunity: One control patient with ACA attributed to anti-protein kinase C gamma-related autoimmunity reacted very weakly with the acetone-fixed (but not with the formalin-fixed) ARHGAP10-transfected cells (1:10 positive; 1:32 equivocal staining only); however, mild staining also of acetone-fixed mock-transfected control cells was seen, leaving the possibility of a non-specific reaction.