Table 2.

Novel tissue-specific genes in caecilians

	Foregut	Heart	Kidney	Liver	Lung	Muscle	Skin	Spleen	Testis	Total
Number of transcriptomes analysed	4	2	5	7	4	3	11	2	2	40
Known vertebrate gene families	19	4	21	18	3	6	15	11	80	177
Gene families shared with the other sampled non-caecilian amphibians	6	2	6	15	2	3	22	—	25	81
Candidate novel caecilian gene families	32	12	40	44	9	27	108	8	142	422
P-value	0. 2671	0.7887	0.4639	1	1	0.2355	4.5e-05	0.01935	0.07605	—

The number of transcriptomes determined for each tissue, and the tissue-specific gene families (caecilian gene families that are already known vertebrate gene families, caecilian gene families shared with the other four sampled non-caecilian amphibians, and candidate caecilian-specific gene families) are shown. The last row shows the P-value (significant values in bold font) for Fisher’s exact test of the difference between the abundance of known vertebrate gene families and those of uncharacterized candidate novel caecilian gene families. Skin tissue includes skin samples from different parts of the body: skin and posterior skin samples, see Supplementary Table S1.