( ( false-negative ( ( A ( negative ( assay result ) ) ) ( that ( should ( have ( been positive ) ) ) ) ) ) . )
(ROOT (S (VP (VB false-negative) (NP (NP (DT A) (JJ negative) (NN assay) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive))))))))) (. .)))
false-negative A negative assay result that should have been positive.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT an) (JJ incorrect) (NN test) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive) (NP (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADJP (JJ false) (JJ negative))))))))))) (. .)))