Sulfated fucans from the egg jellies of the closely related sea urchins Strongylocentrotus droebachiensis and Strongylocentrotus pallidus ensure species-specific fertilization - Vilela-Silva,E.SA.; Castro,M.O.; Valente,A.P.; Biermann,H.C.; Mourão,P.AS. (J Biol Chem, 2002)