test
node1
GO:0008283
cell population
proliferation
node2
GO:0002174
mammary stem cell
proliferation
node1->node2
node3
GO:0048732
gland development
node4
GO:0030879
mammary gland
development
node3->node4
node4->node2
node5
GO:0008150
biological_process
node6
GO:0009987
cellular process
node5->node6
node9
GO:0032502
developmental process
node5->node9
node6->node1
node7
GO:0048856
anatomical structure
development
node8
GO:0048513
animal organ
development
node7->node8
node8->node3
node9->node7
node10
BFO:0000015
process
node10->node5
node11
BFO:0000003
occurrent
node11->node10
node11->node11
node12
BFO:0000001
entity
node12->node11