The ubiquitous snRNA:U6:96Ac promoter drives expression of a single sgRNA (CTTTCGGCTGAGCCACATCA) that targets usp.
Crispr-Cas9 mutagenesis of usp by expressing Spyo\Cas9UAS.Tag:NLS(Unk) under the control of Scer\GAL4GMR71G10 and using uspgRNA.pCFD3-2 as a guide, results in a small frequency of mushroom body gamma neuron pruning defects.