test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node3
BFO:0000015
process
node2->node3
node4
GO:0008150
biological_process
node3->node4
node5
GO:0050896
response to stimulus
node4->node5
node6
GO:0009605
response to external
stimulus
node5->node6
node7
GO:0051606
detection of stimulus
node5->node7
node8
GO:0009581
detection of external
stimulus
node6->node8
node7->node8