A 50 year old male presented with signs and symptoms of restrictive hea disease. A right ventricular endo-myocardial biospy revealed deposition of extracellular eosionophilic hyaline material. On transmission electron microscopy, this material is most likely to reveal the presence of:
Non branching filaments of indefinitive length Cross banded fibres with 67 m periodicity Weibel-Palade bodies Concentric whorls of lamellar structures