[Term] id: PR:000059723 name: polymer-capable small ubiquitin-related modifier, mature form def: "A small ubiquitin-related modifier, mature form that is capable of having additional SUMO chains added to it. This is restricted to SUMO2 and SUMO3." [PRO:DAN] comment: Category=modification. Requested by=Reactome. Note: SUMO1 can only participate in such a polymer as a chain terminator. synonym: "SUMO[2/3]/mature" EXACT PRO-short-label [PRO:DAN] is_a: PR:000059633 ! small ubiquitin-related modifier, mature form union_of: PR:000060214 ! small ubiquitin-related modifier 2, mature form union_of: PR:000060215 ! small ubiquitin-related modifier 3, mature form