test
node1
BFO:0000003
occurrent
node1->node1
node4
BFO:0000015
process
node1->node4
node2
GO:0009653
anatomical structure
morphogenesis
node3
GO:0007164
establishment of
tissue polarity
node2->node3
node5
GO:0008150
biological_process
node4->node5
node7
GO:0032502
developmental process
node5->node7
node6
GO:0048856
anatomical structure
development
node6->node2
node7->node2
node7->node6
node8
BFO:0000001
entity
node8->node1