Are algal genes in nonphotosynthetic protists evidence of historical plastid endosymbioses?

BMC Genomics

Table 2 Fisher exact tests for signal from cyanobacterial genes suggesting a red ancestry.

Group	1^st hits, reds not 2^nd	1^st hits, reds 2^nd	Scaled ratio cyano:other¹	P ²
P. ramorum as query
Cyanobacteria	152	3
Firmicutes	68	1	1.33	0.64
Actinobacteria	120	3	0.8	0.76
Proteobacteria	166	5	0.67	0.82
P. sojae as query
Cyanobacteria	151	4
Firmicutes	60	2	0.79	0.77
Actinobacteria	94	1	2.6	0.37
Proteobacteria	163	3	1.4	0.46
Thalassiosira as query
Cyanobacteria	232	31
Firmicutes	51	0	NA	0.003
Actinobacteria	45	0	NA	0.006
Proteobacteria	160	2	10.3	0.00002
Phaeodactylum as query
Cyanobacteria	199	32
Firmicutes	45	1	7.3	0.014
Actinobacteria	62	1	10.1	0.002
Proteobacteria	162	4	6.44	0.00003

¹Ratios are scaled to absolute number of first hits to avoid biases related to relative sizes of groups' genomic data sets.
²P values shown in bold are significant at experiment-wise a value of 0.05, adjusted to reflect multiple tests.

ISSN: 1471-2164