


Number of sequences required to find evenly divided motifs in random pools of (A) length 40, (B) length 80, and (C) length 120, for modularities of 1 to 4. Results shown for 50% probability of occurrence; for 99%, multiply all pool sized by a factor of 6. Horizontal dark line indicates 1000 zeptomoles. x-Axis shows total length of motif; y-axis shows number of molecules required.










