11. The ArsD family consists of several bacterial arsenical resistance operon trans-acting repressor ArsD proteins. 12. These organic arsenicals were in turn phased out by 2013 in all agricultural activities except cotton farming. 13. Artefacts made of arsenical bronze cover the complete spectrum of metal objects, from axes to ornaments. 14. Some of the tools in the hoard were made of arsenical bronze, or perhaps arsenical copper. 15. Some of the tools in the hoard were made of arsenical bronze, or perhaps arsenical copper. 16. In Europe, phosphorus de-oxidized non-arsenical copper is used with the designation C106. 17. The autopsy of Michael Collins declared the cause of death to be " arsenical poisoning ". 18. Indeed, it seems that arsenical bronze was the most common alloy in use in the Mediterranean basin at this time. 19. In the 19th century, inorganic arsenicals became the preeminent medicines, for instance Fowler's solution, against diverse diseases. 20. Because both of these arsenicals carried considerable risk of side effects, they were replaced for this indication by penicillin in the 1940s.
