Nuclear GTPase found in germinal center B-cells, where it may inhibit function of the activation-induced cytidine deaminase AICDA (PubMed:19734146). Reduces somatic hypermutation in B-cells which may enhance genome stability (By similarity). Expressed in germinal center B-cell and in lymphomas derived from germinal center B-cell. Truncated N-terminus. Probable cloning artifact.