TABLE 2.

Activation of tendon gene expression by in situ hybridization following FGF4 bead implantation to chick limb buds

+, activation of ectopic expression; +/−, slight activation of ectopic expression; −, no detectable expression; n.d., not determined.

Tendon markers	Time after FGF4 bead implantation
	4 h	6 h	12 h	24 h	48 h
Egr1	+	+	+	+	+
Egr2	+/−	+	+	+	+
Scx	+/−	+	+	+	+
Col1a1	−	−	−	+	+
Col3a1	n.d.	n.d.	n.d.	n.d.	+
Col5a1	n.d.	n.d.	n.d.	n.d.	+
Col12a1	n.d.	n.d.	−	+	+
Col14a1	n.d.	n.d.	n.d.	n.d.	+/−