test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node8
BFO:0000015
process
node2->node8
node3
GO:0050896
response to stimulus
node4
GO:0042221
response to chemical
node3->node4
node6
GO:0010033
response to organic
substance
node4->node6
node5
GO:0008150
biological_process
node5->node3
node7
GO:0033993
response to lipid
node6->node7
node8->node5