test
node1
GO:0008150
biological_process
node2
GO:0050896
response to stimulus
node1->node2
node3
GO:0042221
response to chemical
node2->node3
node4
GO:0010033
response to organic
substance
node3->node4
node6
GO:0033993
response to lipid
node4->node6
node5
BFO:0000015
process
node5->node1
node9
GO:0106096
response to ceramide
node6->node9
node7
BFO:0000003
occurrent
node7->node5
node7->node7
node8
BFO:0000001
entity
node8->node7