| take melatonin | 0.46 | I took the melatonin and slept the rest of the night. | ||
| produce melatonin | 0.39 | Melatonin is produced by the pineal gland during the night. | ||
| receive melatonin | 0.26 | Half the animals received melatonin with the safrole. | ||
| secrete melatonin | 0.26 | Melatonin is secreted only during darkness. |