TISSUE PRINTING

An image of the tissue distribution of specific mRNAs, proteins, enzym es, or antigens is conveniently obtained by ''printing'' the cut surfa ce of a tissue section onto a suitable substrate film and developing t he film with appropriate reagents. It is also possible to localize met abolites by tissue printing. Most plant tissues leave a physical print /impression with detailed anatomical information. Epidermal surfaces o f growing organs can be printed without damaging the organ. We provide this review to encourage further use and further development of these convenient and helpful procedures.