test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node6
GO:0003674
molecular_function
node2->node6
node3
GO:0005488
binding
node4
GO:0043167
ion binding
node3->node4
node12
GO:0043169
cation binding
node4->node12
node5
BFO:0000001
entity
node5->node1
node6->node3
node7
GO:0140299
small molecule sensor
activity
node6->node7
node10
GO:0140784
metal ion sensor
activity
node7->node10
node8
GO:0046872
metal ion binding
node9
GO:0005509
calcium ion binding
node8->node9
node11
GO:0061891
calcium ion sensor
activity
node9->node11
node10->node11
node12->node8