BACKGROUND: Nodal/TGF-Lefty signaling pathway has important effects at early stages of differentiation of human embryonic stem cells in directing them to differentiate into different embryonic lineages. LEFTY. one of transforming growth factors in the Nodal/TGF-Lefty signaling pathway. plays an important role in the development of heart. https://parisnaturalfoodes.shop/product-category/herbatint-1n/