test
node1
GO:0042592
homeostatic process
node2
GO:0048878
chemical homeostasis
node1->node2
node5
GO:0050801
monoatomic ion
homeostasis
node2->node5
node3
BFO:0000001
entity
node4
BFO:0000003
occurrent
node3->node4
node4->node4
node8
BFO:0000015
process
node4->node8
node6
GO:0055080
monoatomic cation
homeostasis
node5->node6
node7
GO:0008150
biological_process
node7->node1
node8->node7