“…The blocks were then further treated with 1% uranyl acetate for 1 h (en bloc staining) followed by three washes with distilled water. Increasing concentrations of ethanol (25,50,70,80, 90 and 95%) were used (10 min each) in the process of gradient dehydration. 100% ethanol and propylene oxide were used (three 10 min washes each) for the final process of dehydration.…”