Complex sentence: FAM203B has only one paralog, FAM203A, that is highly conserved and also has no known function, although the homolog of FAM203A in "Caenorhabditis elegans", Y54H5A.2, is thought to help regulate the actin cytoskeleton.
Split into simpler sentences: FAM203B has only one paralog, FAM203A, that is highly conserved but also has no known function. The homolog of FAM203A in "Caenorhabditis elegans", Y54H5A.2, is thought to help regulate the actin cytoskeleton.