test
node1
GO:0009987
cellular process
node2
GO:0033059
cellular pigmentation
node1->node2
node3
BFO:0000003
occurrent
node3->node3
node5
BFO:0000015
process
node3->node5
node4
GO:0008150
biological_process
node4->node1
node6
GO:0043473
pigmentation
node4->node6
node5->node4
node6->node2
node7
BFO:0000001
entity
node7->node3