Isopentenyl transferase / dimethylallyl transferase synthesises isopentenyladensosine 5'-monophosphate, a cytokinin that induces shoot formation on host plants infected with the Ti plasmid [1].

1: Organization and functional analysis of three T-DNAs from the vitopine Ti plasmid pTiS4. Canaday J, Gerad JC, Crouzet P, Otten L; Mol Gen Genet 1992;235:292-303. PMID:1465104