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