Davies A, Spike C, Shaw J, Herman R. Functional overlap between the mec-8 gene and five sym genes in Caenorhabditis elegans. Genetics. 1999;153:117-34 pubmed
..sym-2, sym-3, and sym-4 appear to provide additional functions that are essential in the absence of mec-8(+). ..
Niwa R, Hada K, Moliyama K, Ohniwa R, Tan Y, Olsson Carter K, et al. C. elegans sym-1 is a downstream target of the hunchback-like-1 developmental timing transcription factor. Cell Cycle. 2009;8:4147-54 pubmed
..Given that SYM-1 is a protein secreted from hypodermal cells to the surrounding cuticle, we propose that the adult-specific cuticular structures may be under the temporal control of HBL-1 through regulation of sym-1 transcription. ..
Tischler J, Lehner B, Chen N, Fraser A. Combinatorial RNA interference in Caenorhabditis elegans reveals that redundancy between gene duplicates can be maintained for more than 80 million years of evolution. Genome Biol. 2006;7:R69 pubmed