test
node1
BFO:0000003
occurrent
node1->node1
node5
BFO:0000015
process
node1->node5
node2
BFO:0000001
entity
node2->node1
node3
GO:0032502
developmental process
node4
GO:0048856
anatomical structure
development
node3->node4
node6
GO:0048513
animal organ
development
node4->node6
node8
GO:0008150
biological_process
node5->node8
node7
GO:0048569
post-embryonic animal
organ development
node6->node7
node8->node3