Immunofluorescence of polysulfone haemodialysis membranes. Immunofluorescence of polysulfone haemodialysis membranes. Series A1–E1: immunofluorescent images; series A2–E2, corresponding standard bright field light microscopy images. (A) Troponin (Tn) free serum pool; (B) free cardiac Tn I (cTnI) spiked pool; (C) free cTnT spiked pool; (D) I-C binary complex spiked pool; (E) T-I-C complex spiked pool (all images are transverse sections at ×40 magnification). David C Gaze, and Paul O Collinson Open Heart 2014;1:e000108 ©2014 by British Cardiovascular Society