test
node1
TO:0000277
biochemical trait
node2
TO:0000465
mineral and ion
content trait
node1->node2
node7
TO:0001047
lead content trait
node2->node7
node3
BFO:0000001
entity
node4
BFO:0000002
continuant
node3->node4
node4->node4
node5
BFO:0000020
specifically
dependent continuant
node4->node5
node10
BFO:0000019
quality
node5->node10
node5->node5
node6
PATO:0000001
quality
node5->node6
node11
PATO:0001241
physical object
quality
node6->node11
node8
PATO:0000141
structure
node9
PATO:0000025
composition
node8->node9
node9->node7
node10->node10
node12
PATO:0000051
morphology
node10->node12
node10->node11
node11->node12
node12->node8
node13
TO:0000387
plant trait
node13->node1