Fig. 4

Relationship between percentages of “OA” and “AA”, obtained with a narrowing of the OA distribution. Real values were replaced with 163 RANDOM numbers, generated with the physiological distribution; for AA (0.25–0.39) and R = (4–10), but with an altered distribution of OA, i.e. 3–5 (instead of 1–7), see Methods (r = 0.528, p < 0.001)