FAM9A (Family with Sequence Similarity 9 Member A) is a protein-coding gene that is part of a family of genes with shared sequence similarities. Although its specific functions are still being investigated and are not completely understood, FAM9A is expressed in multiple tissues, including the brain, testis, and ovaries. This indicates it may have roles in critical cellular processes within these organs. Genes in the FAM family commonly contribute to cell signaling, transcription regulation, or protein interactions, but the precise functions of FAM9A are still under study.