KCTD20 Human Gene Knockout Kit (CRISPR) KN421607 USD 1,290.00 2 Weeks KCTD20 - KN2.0, Human gene knockout kit via CRISPR, non-homology mediated. Format 2 gRNA vectors, 1 linear donor Donor DNA EF1a-GFP-P2A-Puro KN421607 is the updated version of KN221607.