Table 1. Cluster distribution.

Genome	protein-coding genes	genes in core clusters	genes in all clusters	clusters in all except this genome
H. salinarum	2675	1337 (50.0%)	2342 (87.6%)	61
H. marismortui	4348	1705 (39.2%)	3770 (86.7%)	2
N. pharaonis	2843	1400 (49.2%)	2444 (86.0%)	20
H. walsbyi	2861	1407 (49.2%)	2422 (84.7%)	78
H. volcanii	4063	1679 (41.3%)	3488 (85.8%)	4
H. lacusprofundi	3665	1556 (42.5%)	3135 (85.5%)	14
H. borinquense	3937	1639 (41.6%)	3311 (84.1%)	1
H. mukohataei	3416	1510 (44.2%)	2999 (87.8%)	6
H. utahensis	3027	1407 (46.5%)	2524 (83.4%)	64
H. turkmenica	5287	2028 (38.4%)	4152 (78.5%)	10