Isolation and characterization of a cDNA encoding a potential morphogen from the marine sponge Geodia cydonium that is conserved in higher metazoans.
S Pahler, A Krasko, J Schütze, I M Müller, and W E Müller
Proc Biol Sci. 1998 March 7; 265(1394): 421–425. PMCID: PMC1688897