Network representation of the evolved angiogenesis automaton presented in Fig. 4. A central green node represents the tumor and is connected to blood vessel nodes near proliferating cancer cells. The number of iterations used to explore nodes in this test was í µí± BFS = 200. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

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... between blood vessels and proliferating cells, designated as 1 in a matrix í µí±. To accomplish this, we initiate the process by establishing a unique node to represent the tumor. Subsequently, an edge between a vertex and the tumor is established whenever a proliferating cell is detected in the 4-neighborhood of the respective node. Fig. 7 shows the network representation of the blood vessel automaton image presented in Fig. 4. Here, the tumor node is denoted by a green central point, while nodes identified in í µí± have been indicated with blue ...