The complete graph generated by successive combination of terms. In the first stage, terms describing the formation of an epithelial tube during the development of the primitive heart tube were inserted into the graph shown in Figure 7. In the second stage, terms that describe the differentiation of cells in the appropriate tissues were inserted. (A) The graph shown from an anatomical perspective. (B) The graph shown from a developmental process perspective. The portion of each term that was derived from the “anatomical” view of development generated in Figure 5A is shown in boldface.