An eye cornea is prepared as a transplant in a laboratory of the Mecklenburg-Western Pomerania Society for Transplant Medicine (GTM-V) in Rostock, Germany, 25 January 2016. Unlike donated organs, tissue does not have to be transplanted right away and can be stored for several weeks or months in special tissue banks and subsequently used in surgeries if needed. Photo: JENS BUETTNER/dpa