Figure 3From: Comparative molecular developmental aspects of the mammalian- and the avian lungs, and the insectan tracheal system by branching morphogenesis: recent advances and future directionsFigure6A-C. Sites where key signaling molecular factors, transcription factors, and other molecular agents are expressed and/or localized to regulate the development and growth of the lung. In the mesenchyme, the areas of expression are not exact.Back to article page