test
node1
GO:0008283
cell population
proliferation
node2
GO:0033687
osteoblast
proliferation
node1->node2
node3
BFO:0000001
entity
node4
BFO:0000003
occurrent
node3->node4
node4->node4
node7
BFO:0000015
process
node4->node7
node5
GO:0008150
biological_process
node6
GO:0009987
cellular process
node5->node6
node6->node1
node7->node5