Fig. 2. Mutations in alr-1 affect gene expression and morphology of the AWA olfactory neurons. (A-D) Top-down views of adult wild type (A), or alr-1(oy42) (B-D) animals stained with anti-ODR-7 antibodies. Nuclei of the AWA neurons are indicated by arrowheads. alr-1(oy42) mutants exhibit loss of ODR-7 expression in one (B) or both (C) AWA neurons, or ectopic ODR-7 expression (D). (E,F) Lateral view of merged Nomarski and fluorescent images of a wild-type (E) or alr-1(oy42) animal (F) expressing an odr-10::gfp fusion gene that allows visualization of the AWA sensory dendrite. Arrows indicate dendritic termination points. Scale bar: 10 µm.