Table 1.

Fraction of twin pairs that share strain-specific variants

Species	Number of twin pairs	Number of twin pairs sharing strain-specific variant signature a	Frequency a	p value
Methanobrevibacter smithii	22	8	0.3636	2.8E−11
Bacteroides caccae	42	6	0.1429	3.9E−06
Bifidobacterium adolescentis	25	5	0.2000	4.5E−06
Alistipes putredinis	114	7	0.0614	1.6E−04
Bacteroides fragilis	13	3	0.2308	2.7E−04
Bacteroides dorei	66	5	0.0758	5.4E−04
Eubacterium hallii	44	4	0.0909	9.9E−04
Phascolarctobacterium faecium	20	3	0.1500	1.0E−03
Bacteroides uniformis	201	8	0.0398	1.0E−03
Blautia obeum	71	4	0.0563	5.7E−03
Bifidobacterium longum	45	3	0.0667	0.01
Dialister invisus	54	3	0.0556	0.02
Akkermansia muciniphila	84	3	0.0357	0.05
Escherichia coli	13	1	0.0769	0.12
Gemmiger formicilis	16	1	0.0625	0.15
Eubacterium siraeum	22	1	0.0455	0.20
Bacteroides vulgatus	87	2	0.0230	0.22
Subdoligranulum sp. APC924/74	100	2	0.0200	0.26
Eubacterium rectale	50	1	0.0200	0.39
Dorea longicatena	54	1	0.0185	0.42
Parabacteroides merdae	32	0	0.0000	1.00
Bacteroides sp. 4_3_47FAA	32	0	0.0000	1.00
Ruminococcaceae bacterium TF06-43	21	0	0.0000	1.00
Coprococcus comes	36	0	0.0000	1.00
Barnesiella intestinihominis	16	0	0.0000	1.00
Streptococcus thermophilus	13	0	0.0000	1.00
Alistipes sp. AM16-43	13	0	0.0000	1.00

^aFrequency for the twin pairs sharing strain-specific variant signature