Induction of bone formation in abdominal implants constituted by collagen sponges embedded with plant‐based human transforming growth factor family proteins in ectopic dog model oleh Juan Carlos Jacinto‐Tinajero, Daniel Ascencio, Brenda Marquina, Jorge Barrios‐Payán, Maria Concepcion Gutierrez, Miguel Gomez Lim, Rogelio Hernández Pando