test
node1
BFO:0000003
occurrent
node1->node1
node6
BFO:0000015
process
node1->node6
node2
GO:0065007
biological regulation
node3
GO:0065008
regulation of
biological quality
node2->node3
node4
GO:0042391
regulation of
membrane potential
node3->node4
node5
GO:0060081
membrane
hyperpolarization
node4->node5
node7
GO:0008150
biological_process
node6->node7
node7->node2
node8
BFO:0000001
entity
node8->node1