nactive Cond ition 21. 3 There are many Protein synthesized No protein Homeoproteins types of DNA-binding Protein phosphorylated domains A HSTF Inactive prots Protein de phosphorylated Figure 2 1.2 The activity of a Inactive protein Ligand binding regulatory transcription 八 factor may be controlled by receptors Inactive prot: synthesis of protein. Cleavage to release active factor covalent modification of 八N protein, ligand binding, or Membran Releas inhibitor binding of inhibitors that 八A sequester the protein or Inactive prot NFk日 affect its ability to bind to nhi bitor DNA 八A 消当 I nactive partFigure 21.2 The activity of a regulatory transcription factor may be controlled by synthesis of protein, covalent modification of protein, ligand binding, or binding of inhibitors that sequester the protein or affect its ability to bind to DNA. 21.3 There are many types of DNA-binding domains