You can create neomycin resistant larvae. Some FRT lines have neomycin resistance marker. If you put neomycin in the food only the larvae that are resistant will grow. -- View this message in context: http://www.nabble.com/Drug-resistances-in-Droso-larvae-t1311539.html#a3681755 Sent from the Bio.net - Dros forum at Nabble.com.