Based on limited published evidence, H4C13 (H4 clustered histone 13) is a histone protein encoded on chromosome 6. The gene's specific molecular function remains largely undocumented in structured databases. However, H4C13 has been identified as a shared transcriptome-wide association signal across multiple psychiatric disorders (bipolar disorder, major depressive disorder, posttraumatic stress disorder, and schizophrenia) in developing brain tissue 1. The gene appears implicated in pathways related to neurotransmitter regulation and neural development, though mechanistic details require further investigation.