. Tissue Arrays : hundreds of tissue sections
  on one single microscope slide

Consists of building, starting from blocks of tissues embedded in paraffin or frozen, new blocks containing several tens to several hundreds of cores of these tissues in order to be able, after cut of these blocks of tissue arrays, to mount microscope slides displaying several tens to several hundreds of tissues.
The tissue array constitutes a new powerful tool for studies in post-genomic and post-proteomic validation.