Table S3.

Mean widths of cultured teeth, in vivo reconstructed teeth, and dental crypts (in mm)

Taxa	Day	Ex vivo			In vivo			Crypt			Ex vivo/in vivo	Ex vivo/crypt
		Width	SD	N	Width	SD	N	Width	SD	N
Mouse	E15	0.467	0.04	7	0.347		1	0.470	0.02	10	1.35	0.99
	E16	0.553	0.07	7	0.351	0.01	3	0.471	0.04	10	1.58	1.17
	E17	0.628	0.04	7	0.510	0.02	3	0.574	0.04	9	1.23	1.09
Vole	E15	0.406	0.06	26	0.299	0.04	3	0.317		1	1.36	1.28
	E16	0.500	0.07	26	0.430	0.01	3	0.477	0.04	2	1.16	1.05
	E17	0.610	0.09	26	0.485	0.01	2	0.603	0.02	5	1.26	1.01

As a result of the tissue shrinkage of fixed soft tissue, the in vivo measurements (from CT reconstructions) can be considered underestimates compared with the crypt (from Fig. S5A) and ex vivo (from cultures) measurements.