Abstract
Tissue of an insect, Lucilia cuprina, fixed conventionally in buffered glutaraldehyde and osmium and embedded in epoxy resin (epon or epon/araldite), provided sections which could readily be labeled with RNAse/gold and wheat germ agglutinin (WGA)/gold. This method offers labeling of tissues with improved contrast and allows the retrospective application of RNAse and WGA labeling to conventionally prepared tissues, without recourse to oxidizing/etching agents.