Table 1.

Numbers of Bacterial and Archaeal Species With Different Gene Sets (Data from AnnoTree v1.2.0 GTDB Release R95).

Nitrogenase-related genes							Number of species
							Bacteria	Archaea
nif	H						3,291	329
nif		D					2,256	116
nif			K				2,237	130
nif				E			2,333	132
nif					N		1,873	83
nif						B	2,293	357
nif	H	D	K			B	169	15
nif	H	D	K	E		B	53	13
nif	H	D	K	E	N	B	1,420	78
Containing at least one nif gene							3,485	373
vnf G							25	8
anf G							101	6