( ( The reaction ) ( ( is ( ( ( ( positive ( -LRB- ( attraction -RRB- ) ) ) or ) negative ) ( -LRB- ( escape -RRB- ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN reaction)) (VP (VBZ is) (ADJP (ADJP (JJ positive)) (PRN (-LRB- -LRB-) (VB attraction) (-RRB- -RRB-)) (CC or) (ADJP (JJ negative)) (PRN (-LRB- -LRB-) (S (VP (VB escape))) (-RRB- -RRB-)))) (. .)))
The reaction is positive (attraction) or negative (escape).
(ROOT (S (S (VP (VBZ Is) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (NP (NN reaction)) (PP (IN for) (NP (DT an) (JJ endothermic) (NN reaction)))))))) (VP (VBZ is) (ADJP (JJ positive))) (. .)))