the intravenous injection of the lighter lanthanide ions pr ( iii ) , nd ( iii ) , and sm ( iii ) in doses of 35 mumoles/kg inhibits , and isoosmolar doses of the heavier lanthanide ions gd ( iii ) , dy ( iii ) , and er ( iii ) stimulate rat liver nuclear in vitro rna synthesis catalyzed by rna polymerase b 24 h after their application , while nuclear rna synthesis , catalyzed by rna polymerase a , was inhibited by the same isoosmolar doses of pr ( iii ) , nd ( iii ) and not influenced by sm ( iii ) , gd ( iii ) , dy ( iii ) , or er ( iii ) .
C0035679
rna polymerase b
C0035681
rna polymerase