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The post-translational isoprenylation pathway. Ydj1 and Lkb1/STK11 have noncanonical CaaX motifs that follow an isoprenylation-only pathway (i.e. nonproteolyzed and noncarboxylmethylated; shunted). Ras and a-factor have canonical CaaX motifs and are subject to the superposition of 3 modifications.
