[D.K.]

http://en.wikipedia.org/wiki/Arsenic

A few species of bacteria are known that use arsenates in respiration. Otherwise, arsenic is notoriously poisonous to most multicellular life, due to the interaction of arsenic ions with protein thiols.

維基本身已經有寫過有d細菌係吸砷生存o既
同上面話以砷構造而成有冇關連呢?