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. 2012 Jan 10;10(1):e1001240. doi: 10.1371/journal.pbio.1001240

The non-indole ascaroside ascr#3 (a small molecule lacking the compound indole, in green) attracts males but repulses hermaphrodites. Adding the tryptophan-derived indole carboxy moiety (red) to ascr#3 produces icas#3, a potent hermaphrodite attractant.

The non-indole ascaroside ascr#3 (a small molecule lacking the compound indole, in green) attracts males but repulses hermaphrodites. Adding the tryptophan-derived indole carboxy moiety (red) to ascr#3 produces icas#3, a potent hermaphrodite attractant.