Endogenous sli is replaced with a uncleavable form of sli (lacks the cleavage site) that is tagged with a 2xTag:MYC-Tag:M(CD8-Unk)-2xTag:V5 cassette at the C terminus. This results in the encoded protein being membrane-bound (due to Tag:M(CD8-Unk)).
sliUC.TM embryos exhibit some instances of midline crossing at commissural sites and intermittently defasciculated outermost axon tracts.