Selected biological properties of human mater grafts obtained from different-age donors and preserved with two methods were tested in a xenogenic system of transplantation. The Regional Lymph Node Blastic Cell Reaction Test revealed relatively low immunogenicity of the material. Microscopic analysis showed that trypsinized grafts are rebuilt at a slower rate and evoke less local reaction than the ethanol-stabilized grafts. No influence of the donors' age on immunogenicity and local reaction after transplantation was observed.
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