This family of proteins is found in eukaryotes. The function of this family is unknown. Murine FAM198B is downregulated by FGFR signalling [1].

1: Gene expression profiling of differentiating embryonic stem cells expressing dominant negative fibroblast growth factor receptor 2. Meszaros R, Akerlund M, Hjalt T, Durbeej M, Ekblom P; Matrix Biol. 2007;26:197-205. PMID:17174081