Figure 1
From: Programmed cell death in host-symbiont associations, viewed through the Gene Ontology
"GO: 0012501 programmed cell death" and its child terms depicted in a screenshot of the Gene Ontology AmiGO browser [1]. Most terms shown here below "GO: 0012501 programmed cell death" are types of programmed cell death, symbolized by the logo showing an "I" inside a square, which denotes the "is_a" relationship. However, three terms (various logos with "R") describe the "regulates" type of relationship. For more information on ontology structure, including term-term relationships, see [13].