Figure 23-13 i Regulation of ribonucleotide Allosteric regulators alter the state of oligomerization. shown in green have high activity and states shown red States has been omitted for simplicity in have little or no activity R2 After Kashlan, O B., Scott, C.P, Lear, B.S., Biochemistry 41, J.D., and man, 461 (2002).]