A U6 promoter drives expression of 2 sgRNAs (5'-tggatatatctttcggctag-agg-3' and 5'-agaccaaaacctgtggggca-agg-3'), both of which target intron 2 of the L-RC isoform (the two target sites flank the location of the opus{}Mohr insertion that is present in a number of dominant L mutant chromosomes).
Expression of LU6.sgRNA.DE1 under the control of Spyo\Cas9Act5C.cPa in a L2/+ background variably suppresses the L2/+ eye phenotype.