Figure 4 | Green fluorescent protein screen.   a | STR-2 (seven trasmembrane receptor 2) is a candidate odorant receptor that is expressed in only one of the bilaterally symmetric AWC olfactory neurons in the wild type. Screens for mutants that are defective in left–right asymmetry identified mutants that expressed str-2::GFP in either b | both cells (arrows) or c | neither cell, although there is still faint staining in the cell body (arrowhead)⁵⁷. Photos reproduced with permission from Ref. 57 © (2001) the Genetics Society of America, courtesy of C. Bargmann. In all panels, dorsal is top and ventral is bottom. Anterior is to the left.

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© 2002 Nature Publishing Group