test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node7
BFO:0000015
process
node2->node7
node3
GO:0042391
regulation of
membrane potential
node4
GO:0016057
regulation of
membrane potential in
photoreceptor cell
node3->node4
node5
GO:0065007
biological regulation
node6
GO:0065008
regulation of
biological quality
node5->node6
node6->node3
node8
GO:0008150
biological_process
node7->node8
node8->node5