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Across
  1. 3. The addition of an acetyl group, often on lysine residues, that can regulate gene expression.
  2. 6. The attachment of phosphate groups to proteins, commonly regulating enzyme activity.
  3. 7. A modification marking proteins for degradation by the proteasome.
Down
  1. 1. Involves adding a small ubiquitin-like modifier (SUMO) protein, influencing nuclear transport and stability.
  2. 2. The process where carbohydrates are attached to proteins or lipids, influencing protein folding and stability.
  3. 4. The cleavage of peptide bonds, often activating or deactivating proteins.
  4. 5. The addition of methyl groups, frequently on histones, affecting chromatin structure and gene expression.