Figure 3From: Stimulation of Activin A/Nodal signaling is insufficient to induce definitive endoderm formation of cord blood-derived unrestricted somatic stem cellsAlizarin red staining of USSC. Representative light micrographs depicting calcium deposits detected by Alizarin red staining in Normal serum control, Low serum control and Activin A treated USSC (100×) before and after mesoderm differentiation.Back to article page