Weak chemotaxis toward low concentrations of sodium acetate. qr2 were more preferentialy attracted by diacetyl than WT in simultaneous two-spot presentation of sodium acetate and diacetyl. Mutagen used was Mos1 transposon, but it is not an insertion allele.

Isolated in Christian Rocheleau's backyard in Montreal, Quebec, Canada.

C. briggsae wild isolate from Montreal, Canada (C. Rocheleau).