test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node3
GO:0008150
biological_process
node2->node3
node6
GO:0050896
response to stimulus
node3->node6
node4
GO:0009628
response to abiotic
stimulus
node5
GO:0051602
response to
electrical stimulus
node4->node5
node6->node4
node7
BFO:0000001
entity
node7->node1