CCBL2 is an aminotransferase that transaminates kynurenine to form kynurenic acid. Kynurenic acid is a metabolite of tryptophan. Multiple alternatively spliced transcript variants that encode different proteins have been described for this gene. One of the transcripts encodes a predicted protein that has sequence identity to the protein encoded by the RNA binding motif protein, X-linked gene (RBMX).This gene encodes an aminotransferase that transaminates kynurenine to form kynurenic acid. Kynurenic acid is a metabolite of tryptophan. Multiple alternatively spliced transcript variants that encode different proteins have been described for this gene. One of the transcripts encodes a predicted protein that has sequence identity to the protein encoded by the RNA binding motif protein, X-linked gene (RBMX).