all the ammonium salts and amines , but not polyamines , were strong and selective inhibitors of rrna synthesis at 1.25-5.0 mm . alpha-methylornithine did not inhibit rrna synthesis , although it inhibited ornithine decarboxylase , an enzyme claimed to be a direct stimulator of rrna synthesis .
C0002508
amines
C0032433
polyamines