test
node1
BFO:0000040
material entity
node2
PO:0025131
plant anatomical
entity
node1->node2
node8
PO:0009011
plant structure
node2->node8
node3
PO:0009007
portion of plant
tissue
node4
PO:0005679
plant epidermis
node3->node4
node5
BFO:0000001
entity
node6
BFO:0000002
continuant
node5->node6
node6->node6
node7
BFO:0000004
independent
continuant
node6->node7
node7->node7
node7->node1
node8->node3