TABLE 2.

Allocation of cluster designations

Host phylum	Host genus	Designations	Number
Actinobacteria	Mycobacterium	A–Z, AA–AJ	40
	Arthrobacter	AK–AZ, FA–FZ	42
	Streptomyces	BA–BT	20
	Propionibacterium	BU–BZ	6
	Rhodococcus	CA–CP	14
	Gordonia	CQ–DZ	36
	Microbacterium	EA–EM	13
	Corynebacterium	EN–EZ	13