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Table 3 Hierarchies of Potency Based on LOAELs for the Oviductal Assays

From: Pyrazine derivatives in cigarette smoke inhibit hamster oviductal functioning

Ciliary Beat Frequency pyrazine = 2-methylpyrazine = 2-ethylpyrazine > 2-methoxy-3-methylpyrazine = 2,3,5-trimethylpyrazine > 2,5-dimethylpyrazine > 2,6-dimethylpyrazine
Oocyte Pickup Rate 2-methoxy-3-methylpyrazine > 2-methylpyrazine = 2-ethylpyrazine = pyrazine = 2,5-dimethylpyrazine > 2,3,5-trimethylpyrazine > 2,6-dimethylpyrazine
Infundibular Smooth Muscle Contraction Rate 2-methoxy-3-methylpyrazine = 2-ethylpyrazine > 2-methylpyrazine > 2,3,5-trimethylpyrazine = 2,5-dimethylpyrazine = pyrazine > 2,6-dimethylpyrazine