Results are shown for tests
involving japonica, indicaIR64, ausDJ123, O. nivara, and O. rufipogon (table 1) but results from the full combination of comparisons are listed in the supplementary table S3, Supplementary Material online.
In more than 18 person - years of maintaining a colony of D.
japonica that
involves more than 15,000 control worms in just the last five years alone, the Tufts researchers have never observed a spontaneous occurrence of double - headedness.