Biochemistry Which of the following does not or permissive euchromatin due to changes occurring at cytosine residues at CpG islands in DNA? A Methylation B Alkylation C Phosphorylation D Sumoylation 💡 Explanation Which of the following does not or permissive euchromatin due to changes occurring at cytosine residues at CpG islands in DNA? ✓ Correct Answer: A. Methylation