( ( Positive ( or ( negative reactions ) ) ) ( welcomed - ) )
(ROOT (S (NP (JJ Positive) (CC or) (JJ negative) (NNS reactions)) (VP (VBD welcomed)) (: -)))
Positive or negative reactions welcomed -
(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))) (. .)))