sentence1_binary_parse: ( ( ( ( ( ( ( receptors , ) ( second messengers ) ) , ) and ) ion ) channels ) ; )
sentence1_parse: (ROOT (NP (NP (NNS receptors)) (, ,) (NP (JJ second) (NNS messengers)) (, ,) (CC and) (RB ion) (NP (NNS channels)) (: ;)))
sentence1: receptors, second messengers, and ion channels;
sentence2_parse: (ROOT (S (NP (NNP Calcium) (NNP ion)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ second) (NN messenger))))) (. .)))
sentence2: Calcium ion is an example of a second messenger.