The present invention provides compositions and methods of using embryonic-like stem cells that originate from a post-partum placenta with conventional cord blood compositions or other stem or progenitor cells. The embedded chip package structure includes a supporting board with a protruding section, a semiconductor chip formed on the protruding section of the supporting board, a dielectric layer formed on the supporting board and the semiconductor chip, and a circuit layer formed on the dielectric layer. The styrenated crosslinkable monomer can also be produced from a two arm polyethylene oxide having a molecular weight between 100 kgmol and 800 kgmol.