Burdon R H, Douglas J T
Nucleic Acids Res. 1974 Jan;1(1):97-103. doi: 10.1093/nar/1.1.97.
Soluble factors appear to be present in both nuclei and cytoplasm of Krebs 2 ascites tumour cells capable of stimulating the enzyme catalysed methylation of DNA in isolated nuclei from these cells.