Table 1. Summary of Claudin expression patterns.

	1*	2	3	4	5*	8	10	11	12	14	15	16	17	18	22	23
Gastrulation (HH4 - HH7)
Epiblast	++	+	+	+	-	+	+	+	+	+	+	+	+	+	+	+
Mesoderm	-	+	-	+	-	-	+	-	-	-	+	-	+	-	-	+
Endoderm	+	+	-	+	-	+	+	+	-	+	+	+	+	+	-	+
Hensen's node	-	+	-	+	-	+	+a	-	-	+	+	+	+	+	-	+
Extraembryonic ectoderm	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+
Neurulation (HH8-HH12)
Neural ectoderm	-	+	-	+	-	+	+	-	-	+	+	+	+	+	-	+
Non-neural ectoderm	+	+	++	+	-	+	++	++	+	+	+	+	+	+	++	+
Pharynx	+	+	++	++	-	+	-	-	-	++	+	+	++	+	+	+
Heart	-	++	-	-	-	-	+	-	-	+	-	-	-	-	-	-
Somites	-	+	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Vasculature	-	-	-	-	++	-	-	-	-	-	-	-	-	-	-	-
Organogenesis (E3-E10)
Eye epithelium	+	+b	+	+	-	+	+b	-	-	+	+	+	+	+	+	-
Otic vesicle	+b	-	++b	+	-	+	+	+	+b	+	+b	+	-	-	-	-
Nasal epithelium	+	+	+	-	-	+b	+b	+b	+b	+b	+b	+b	+b	+b	-	+b
Limb ectoderm	+	+	+	+	-	+	+	+	+	+	+	+	+	+	+	+
Apical ectodermal ridge	+	-	+	+	-	-	-	+	+	-	-	+	-	+	+	-
Surface ectoderm	+	+	++b	+	-	+	+b	+b	+b	+	+b	+	+	+	+b	+
Feather buds	+	-	+	+	-	-	-	-	-	-	-	-	-	-	-	-
Pancreas	+	-	+	+	-	-	-	+	-	-	-	-	-	-	-	-
Lung	+	-	+	-	-	-	+	-	-	-	-	-	-	-	-	-
Kidney	+	-	+	+	-	-	++	-	-	-	-	-	-	-	-	-
Gonad	n/a	-	-	-	-	-	-	++	-	-	-	-	-	-	-	-
Heart	-	+	-	-	-	-	-	+	-	-	-	+	+	-	-	+

^*, the expression patterns of Claudin-1 and Claudin-5 have been published previously; -, absent expression; +, positive expression; ++, robust expression ; +a, asymmetric expression; +b, expression with boundaries