test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node5
BFO:0000015
process
node2->node5
node3
GO:0009605
response to external
stimulus
node4
GO:0009991
response to
extracellular
stimulus
node3->node4
node8
GO:0031667
response to nutrient
levels
node4->node8
node6
GO:0008150
biological_process
node5->node6
node7
GO:0050896
response to stimulus
node6->node7
node7->node3