title: Effect of chemical animalization and vegetalization on the synthesis of ribosomal RNA in sea urchin embryos.
abstract: Treatment of embryos of Paracentrotus lividus with a concentration of ZnSO4which causes animalization, strongly inhibits the initiation of ribosomal RNA synthesis.The vegetalizing agent LiCl does not seem clearly to affect the synthesis of this RNA.
authors.affiliation: Laboratory of Comparative Anatomy of the University and Research Unit for Molecular Embryology of the CNR, Palermo, Italy.
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Pirrone
authors.affiliation: Laboratory of Comparative Anatomy of the University and Research Unit for Molecular Embryology of the CNR, Palermo, Italy.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Sconzo
authors.affiliation: Laboratory of Comparative Anatomy of the University and Research Unit for Molecular Embryology of the CNR, Palermo, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Mutolo
authors.affiliation: Laboratory of Comparative Anatomy of the University and Research Unit for Molecular Embryology of the CNR, Palermo, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Giudice