test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node7
GO:0008150
biological_process
node2->node7
node3
GO:0042592
homeostatic process
node4
GO:0048878
chemical homeostasis
node3->node4
node5
GO:0033500
carbohydrate
homeostasis
node4->node5
node6
BFO:0000001
entity
node6->node1
node7->node3