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An orthologue of AS3MT is found in bacteria and is called Cm Ars M.

elucidating the pathway for arsenic methylation-9elucidating the pathway for arsenic methylation-59elucidating the pathway for arsenic methylation-62elucidating the pathway for arsenic methylation-49

Despite, or possibly because of, its long-known toxicity, arsenic-containing potions and drugs have a history in medicine and quackery that continues into the 21st century.

The mechanisms by which these sources affect "downstream" living organisms remains uncertain but are probably diverse.

One commonly cited pathway involves methylation.) are used as feed additives for livestock, including 4-hydroxy-3-nitrobenzenearsonic acid (3-NHPAA or Roxarsone), ureidophenylarsonic acid, and p-arsanilic acid.

This pattern is general for other related elements, including selenium, which can exhibit both beneficial and deleterious effects.

Arsenic biochemistry has become topical since many toxic arsenic compounds are found in some aquifers, Several of these organoarsenic compounds arise via methylation processes.

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