rubber cis-polyprenylcistransferase activity https://github.com/geneontology/go-ontology/issues/20661 molecular_function rubber polymerase activity rubber transferase activity MetaCyc:2.5.1.20-RXN RHEA:18801 cis-prenyl transferase activity isopentenyl pyrophosphate cis-1,4-polyisoprenyl transferase activity Catalysis of the reaction: (cis-prenyl)n-diphosphate + isopentenyl diphosphate = (cis-prenyl)(n+1)-diphosphate + diphosphate. poly-cis-polyprenyl-diphosphate:isopentenyl-diphosphate polyprenylcistransferase activity GO:0050267 rubber prenyltransferase activity rubber allyltransferase activity EC:2.5.1.20 prenyl diphosphate synthase activity