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Receptor comparisons by classification. Breadth of tuning did not differ between Class I and Class II receptors by either (A) number of agonists or (B) coverage of odorant space. (C) Sensitivity did not differ between Class I and Class II receptors. Breadth of tuning did not differ between human and mouse receptors by either (D) number of agonists or (E) distance in odorant space. (F) Human receptors were significantly more sensitive to odorants than mouse receptors (p < 0.008).
