test
node1
BFO:0000003
occurrent
node1->node1
node9
BFO:0000015
process
node1->node9
node2
GO:0009416
response to light
stimulus
node3
GO:0009648
photoperiodism
node2->node3
node4
GO:0008150
biological_process
node5
GO:0050896
response to stimulus
node4->node5
node6
GO:0009628
response to abiotic
stimulus
node5->node6
node8
GO:0009314
response to radiation
node6->node8
node7
BFO:0000001
entity
node7->node1
node8->node2
node9->node4