Table 1. Cross-genome comparison of Parcunitrobacteria and the six most closely related parcubacterial species.

	Parcunitrobacteria	OD1-1	OD1-2	OD1-3	OD1-4	OD1-5	OD1-6
A- Average percent amino acid identity for proteins encoded in the Parcunitrobacteria genome and the six most closely related Parcubacteria (OD1) genomes
Parcunitrobacteria	—	48	47	47	50	49	47
OD1-1	48	—	58	52	51	52	58
OD1-2	47	58	—	53	51	52	59
OD1-3	47	52	53	—	52	52	52
OD1-4	50	51	51	52	—	70	51
OD1-5	49	52	52	52	70	—	51
OD1-6	47	58	59	52	51	52	—
B- Percentage of ORFs orthologous between pairs of Parcubacteria (OD1) genomes
Parcunitrobacteria	—	29	17	18	29	28	27
OD1-1	35	—	22	24	36	32	37
OD1-2	38	40	—	29	38	32	38
OD1-3	38	43	27	—	41	36	38
OD1-4	39	40	22	25	—	49	36
OD1-5	37	35	19	22	48	—	33
OD1-6	32	37	20	21	32	30	—

(A) Percent amino acid identity among the analyzed OD1 genomes. (B) Percent (%) of ORFs that are orthologous for the OD1 genomes. OD1-1: GWB1_GWB1_OD1_42_6_43_6; OD1-2: GWF2_Parcubacteria_42_8; OD1-3: GWF2_Parcubacteria_bacterium_GW2011_GWF2_39_13b_39_13; OD1-4: RIFCSPHIGHO2_01_FULL_RIFCSPHIGHO2_01_FULL_RIF_OD1_08_40_12b_curated_40_12; OD1-5: RIFCSPLOWO2_01_FULL_RIFCSPLOWO2_01_FULL_RIF_OD1_08_38_39_curated_38_39; OD1-6: RIFCSPLOWO2_01_FULL_RIFCSPLOWO2_01_FULL_RIF_OD1_08_43_11_curated_43_11.