test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node4
GO:0008150
biological_process
node2->node4
node3
BFO:0000001
entity
node3->node1
node5
GO:0065007
biological regulation
node4->node5
node8
GO:0065008
regulation of
biological quality
node5->node8
node6
GO:0042391
regulation of
membrane potential
node7
GO:0086009
membrane
repolarization
node6->node7
node8->node6