Recently, TRIM (tripartite motif-containing) proteins attrackted much attention. These receptors constitute a large family of proteins involved in an innate immunity and in a broad range of biological processes. Their universality is conditioned by their diversity, differences in tissue expression and cell localization. TRIMs have been classified into 9 families C-I to C-IX, and additionally C-X and CXI have been described recently. Numbers of TRIMPs vary in different animal species.