The RMCE cassette in TI{TI}18wattP has been replaced with mutated 18w sequence, reconstituting a 18w locus in which the tyrosine residues in the C2 cluster of the C-terminal domain have been mutated so that they are non-phosphorylatable (this region is normally targeted by Src).
18wC2YF is a non-suppressor of embryo | maternal effect phenotype of Toll-65A, Tollo59