Figure 4
Chemosensory receptor expression in single olfactory rosettes of adult (A-C) and larval (D-F) sea lamprey. The left and center panels display olfactory sensory neuron-specific Golfα antisense RNA probe. (A) Cross section through the olfactory organ reveals the radial organization of the lamellae in the adult sea lamprey single olfactory rosette. (B) The olfactory epithelium is visible as a band lining the lamellae radiating from the wall of the olfactory chamber. (C) Cells expressing the olfactory receptor (6425.OR330a) in adults are located in the medial region of olfactory epithelium. (D) Note that instead of the convolutions of the adult olfactory lamellae there is a single layer of olfactory epithelium covering the olfactory wall that also expresses Golfα in the larval stage (E). (F) The olfactory sensory neurons expressing the olfactory receptor in larval sea lamprey are indicated by arrows. Scale bar: (A, B, D, E) 500 μm; (C, F) 50 μm.