Rapid three-dimensional reconstruction at the light microscopic level and a technique for re-embedding the same semithin sections for electron microscopic examination.

Rapid three-dimensional reconstruction of serial sections at the light microscopic and ultrastructural levels was accomplished using a two-step technique. Fixed specimens were embedded in Epon and 1 microns sections were cut and placed on glass slides. One of every four sections was drawn onto transparency film for rapid three-dimensional reconstruction. The semi-thin sections were re-embedded in Epon and sectioned at 90 nm for examination in the electron microscopy.