Expressed in brain, notably in regions involved in long-term potentiation and long-term depression, such as hippocampal CA1 and CA3, dentate gyrus and cerebellar Purkinje layer. Located on the opposite DNA strand of the CNGA1 gene at chromosome 4p13. Its transcription may play a role in CNGA1 transcription regulation. Could be the product of a pseudogene. According to PubMed:12388767, it is not clear whether this transcript encodes a protein.