test
node1
BFO:0000003
occurrent
node1->node1
node3
BFO:0000015
process
node1->node3
node2
BFO:0000001
entity
node2->node1
node4
GO:0008150
biological_process
node3->node4
node5
GO:0065007
biological regulation
node4->node5
node6
GO:0065008
regulation of
biological quality
node5->node6