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The C. elegans DM domain gene mab-23 defines the pattern of dopaminergic fate expression among sex-specific sensory neurons in the male nervous system. Shown here is the ventral view of a C. elegans male expressing a gfp reporter transgene for the dopaminergic cell fate marker cat-2 (tyrosine hydroxylase) in male-specific ray sensory neurons. The C. elegans male tail is sexually specialized and bears nine bilateral pairs of finger-like ray sensory organs, embedded in an acellular fan. The rays are used to sense the hermaphrodite during mating. mab-23 activity confines CAT-2::GFP expression to three pairs of ray neurons. The CAT-2::GFP chimeric protein also localizes to sensory dendritic endings for unknown reasons. (For details, see Lints and Emmons, p. 2390.)