The ubiquitous snRNA:U6:96Ac promoter drives expression of six sgRNAs targeting Rab8, Rab10 and RabX4 (target sequences: ATCACCACGGCCTATTACAG, CAGCATTTTCTCGACATCGG, ATCAAAACAGTCGAGCTGCG, AGTGCGATATGACGGACAAG, GGCGCCCCGATAGTACGCCG and CGCATGGTGGACAAGGAGAG).