A U6 promoter drives expression of 2 sgRNAs (5'-gttattggtgatctccttgg-tgg-3' and 5'-gctctttggcactcggcctt-tgg-3'), both of which target exon 1 of the L-RB isoform.
Expression of LU6.sgRNA.cbm1 under the control of Spyo\Cas9Act5C.cPa in a L2/+ background variably suppresses the L2/+ eye phenotype.