“…The absolute requirement of WNT activity in hESC renewal is contested but it appears that nuclear β-catenin signaling is dispensable for ESC maintenance (Kim et al, 2013) and WNT activation leads to differentiation of hESCs (Davidson et al, 2012;Dravid et al, 2005). Combining various chemically defined conditions, cell plating strategies, and activation of signaling pathways, such as activin, Nodal and FGF, WNT activation via GSK3 inhibition or constitutively active β-catenin can direct the differentiation of hESCs into a number of embryonic cell types, including primitive streak/mesendoderm (Funa et al, 2015;Gouti et al, 2014;Nakanishi et al, 2009;Sumi et al, 2008;Tsakiridis et al, 2015), paraxial mesoderm (Shelton et al, 2014;Tan et al, 2013;Umeda et al, 2012), lateral plate mesoderm (Tan et al, 2013), caudal neural plate, and axial stem cell progenitors (Denham et al, 2015;Tsakiridis et al, 2015). ) and neural border genes (NB: PAX7, PAX3, MSX1, TFAP2A) genes to WNT, BMP and FGF signaling analyzed by RT-PCR in D3+CHIR cultures exposed to specific modulators.…”