This graph shows the dose-response curves for two different chemicals. For the chemical represented by Line A, the response begins at a very low dose and increases sharply. The maximum response is reached at a low concentration. For the chemical represented by Line B, the response increases only gradually as the dose of chemical is increased. Scientists would say that the chemical graphed as Line B has a lower potency than the chemical in Line A because it takes a greater dose of chemical to cause a similar response.

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