test
node1
GO:0051606
detection of stimulus
node2
GO:0009595
detection of biotic
stimulus
node1->node2
node9
GO:0060245
detection of cell
density
node2->node9
node3
GO:0009607
response to biotic
stimulus
node3->node2
node4
BFO:0000003
occurrent
node4->node4
node5
BFO:0000015
process
node4->node5
node8
GO:0008150
biological_process
node5->node8
node6
GO:0050896
response to stimulus
node6->node1
node6->node3
node7
BFO:0000001
entity
node7->node4
node8->node6