Formalin-fixed paraffin-embedded (FFPE) tissue specimens are mainly used by the medical community and researchers to preserve biopsy samples in formaldehyde and then embed them into paraffin wax blocks. This process preserves the proteins and structures of the tissue. After storing it into a block, thin slices of the FFPE block can be made and is then mounted on a microscope slide to enable examination.  |   https://www.histobiolab.com/ffpe-tissue.html