Using homology method, mutant ricin toxin A-chain(MRTA) deleting part of amino acid sequence was modeled by molecular mechanics optimization and molecular dynamics simulated annealing.

利用同源模建的方法，借助分子力学优化、分子动力学模拟退火设计构建了删除部分氨基酸序列的蓖麻毒素A链突变体（MRTA）。

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They were close to weaponizing ricin - a lethal plant toxin.

他们快把蓖麻毒素——一种致命的植物毒素——研发成武器了。

《柯林斯英汉双解大词典》

They were close to weaponizing ricin —a lethal plant toxin.

他们快把蓖麻毒素——一种致命的植物毒素——研发为武器了。

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Roger Wicker, a Mississippi Republican, received a letter containing ricin, a toxin derived from the castor oil plant.

WSJ: Best of the Web Today: Fascism by the Numbers

Dutschke, the affidavit stated, also said he'd never researched anything about ricin, a toxin derived from castor beans that has no known antidote.

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Four elderly men from the US state of Georgia have appeared in court charged with plotting to murder officials using explosives and the lethal toxin ricin.

BBC: Elderly men accused of US ricin plot