The regulated genes were classified in different groups. An essential part of the genes upregulated with rejection, as expected, point to a massive immune response. With rejection, a large amount of the genes coding for proteins with transport activity or proteins involved in metabolism are downregulated (e.g. amino acid transport, glucose transport, K+-, Ca++- and phosphate transport, transport of water, pH regulation). It was shown that, with rejection, signal transduction pathways involved in protein catabolism and immune response are upregulated.