Table 1. Arsenic-related genes involved in bacterial arsenic resistance and transformation.

Family	Gene	Product
ars	arsR	Arsenic transcriptional regulator
	arsB	Arsenic efflux pump
	arsC	Arsenate reductase
	arsH	Putative flavoprotein
	acr3	Arsenic efflux pump ACR3 family
	arsA	Arsenite active ATPase
	arsD	ars operon trans-acting repressor
	arsO	Monooxygenase
	glo	Glyoxalase/bleomycin resistance protein
	mfs	Major facilitator superfamily
arr	arrA	Respiratory As(V) reductase large subunit
	arrB	Respiratory As(V) reductase small subunit
aio	aioA	Arsenite oxidase large subunit
	aioB	Arsenite oxidase small subunit
	aioX	Phosphonate-binding periplasmic protein
	aioS	Periplasmic sensor, signal transduction, histidine kinase
	aioR	Two component, sigma54 specific, transcriptionalregulator, Fis family protein
	aioC	Cytochrome c, monoheme
	aioD	Molybdenum cofactor biosynthesis protein A
arsM	arsM	Arsenite S-adenosylmethyltransferase

Note: ars, cytoplasmic AsV reduction; arr, periplasmic AsV reduction; aio, arsenite oxidation; arsM, arsenite methylation.