a, b, Effect of active (12) and inactive (1) palmostatin analogs on N-Ras (a, b) and global protein (a) palmitoylation as detected by pulse-chase metabolic labeling of ON cells (or ONK control cells) with the 17-ODYA probe. Data shown are representative of three independent experiments. For b, N-Ras was immunoprecipitated using anti-GFP antibodies prior to visualizing palmitoylation by CuAAC conjugation to a Rh-N3 reporter tag (top panel). Total N-Ras content was measured by Western blotting of GFP enrichments (bottom panel).c, Quantification of palmostatin analog effects on N-Ras palmitoylation; data represent average values ± s.d. from three independent biological replicates, where densitometry was performed on N-Ras signals from anti-GPF immunoprecipitations as shown in b (top panel).