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A: Expression of a transcript similar to medium-chain fatty acyl-coenzyme A synthetase (O-MACS) in OSNs and sustentacular cells was restricted to the dorsal regions of the olfactory epithelium, approximating OR expression zone 4. Its expression in Bowman’s glands extended more ventrally. B: Detail showing the sharp border in expression in OSNs and sustentacular cells (arrowheads) and the more gradual dimunition in Bowman’s glands (arrows). Scale bars = 250 μm in A; 50 μm in B.
