TALEN TALEN TALENs TALEN TALEN Repeat Variable Diresidue (RVD) Transcription activator-like effector nuclease TALEN TALENs TALENs Transcription activator-like effector nuclease TALEN TALENs transcription activator-like nucleases Transcription activator-like effector nuclease Repeat Variable Diresidue (RVD)