test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node5
GO:0008150
biological_process
node2->node5
node3
GO:0061245
establishment or
maintenance of
bipolar cell polarity
node4
GO:0035088
establishment or
maintenance of
apical/basal cell
polarity
node3->node4
node6
GO:0009987
cellular process
node5->node6
node7
GO:0007163
establishment or
maintenance of cell
polarity
node6->node7
node7->node3
node8
BFO:0000001
entity
node8->node1