1982-67-8 65709-93-5 Azetidines Bacterial Toxins Cell death EC 6.3.1.2 Glutamate-Ammonia Ligase HR HSP70 Heat-Shock Proteins Heat shock protein 70 Hsp Journal Article MSX Methionine Sulfoximine Nicotiana benthamiana PCD PCR RT-PCR Research Support, Non-U.S. Gov't Tabtoxinine-β-lactam TβL VIGS Virus-induced gene silencing heat shock protein hypersensitive response l-methionine sulfoximine polymerase chain reaction programmed cell death qRT-PCR quantitative real time polymerase chain reaction