Intact total and polyadenylated RNA have been isolated from unfertilized eggs of the brown marine macroalga Fucus serratus. The presence of functional messenger RNA has been demonstrated by translation in vitro. The major in-vitro translation product has an apparent molecular mass of 42 kDa. Immunoprecipitation of translation products of egg RNA using an anti-actin antibody yields a polypeptide which co-migrates with this major translation product.