FAM9A (Family with Sequence Similarity 9 Member A) is a protein-coding gene belonging to a family of genes with sequence similarity. Although its specific functions are still being studied and are not yet fully understood, FAM9A is expressed in several tissues, including the brain, testis, and ovaries. This indicates it may have roles in important cellular processes within these organs. Genes in the FAM family often participate in cell signalling, transcription regulation, or protein interactions, although the precise functions of FAM9A remain under investigation.