A gene replacement approach was used to create NempRR1 and NempRR2 where the white gene replaced the Nemp ORF. The sequences surrounding the junctions are “GTTGCTTTTTCATTCGATTCCTTAAAGTAAAGTAAACATCAAAACATCAAGCATAAGCAAGTCAGCA” and "GACCACCACGTTCTATGCTGTACCGTTCTGTAAAATTTGTTTGTTTGGTTACCCTTTCTAATATTTGTATAATCACTTGCAGACTGAACGGAAACACACATATTAATACAAATTATATATTTAATTATTCATGACTGGCTAGGAATAAAAACACTTATAC”.