Abstract
Two RNA-polymerases (I and II) and several protein fractions (A, B and C) have been isolated from chromosomal acidic proteins of coconut nuclei. Fraction B stimulates the activity of both the RNA-polymerases and appears to be an initiation factor. RNA-polymerase I is sensitive to rifampicin when the drug is added to the enzyme first before the addition of factor B, but insensitive when the order of addition is reversed. Fraction C has an inhibitory effect on both the RNA-polymerases.