test
node1
TO:0000250
plant vigor trait
node2
TO:0000068
lodging incidence
node1->node2
node3
CO_322:0000034
maize root lodging
incidence trait
node2->node3
node4
CO_322:0000899
maize rlodginc_e_pct
variable
node3->node4
node5
TO:0000387
plant trait
node5->node1