( ( The ( protein-tyrosine kinases ) ) ( ( are ( ( ( a ( large family ) ) ( of ( related proteins ) ) ) ( ( ( whose enzymatic ) activity ) ( is ( regulated ( by ( ( ( ( ( directly or ) indirectly ) binding ) extracellular ) ( `` ( signal ( '' molecules ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ protein-tyrosine) (NNS kinases)) (VP (VBP are) (NP (NP (DT a) (JJ large) (NN family)) (PP (IN of) (NP (JJ related) (NNS proteins))) (SBAR (WHNP (WP$ whose) (ADJP (JJ enzymatic)) (NN activity)) (S (VP (VBZ is) (VP (VBN regulated) (PP (IN by) (NP (NP (ADJP (ADVP (RB directly) (CC or) (RB indirectly)) (JJ binding)) (NN extracellular)) (NP (`` ``) (NN signal) ('' '') (NNS molecules)))))))))) (. .)))
The protein-tyrosine kinases are a large family of related proteins whose enzymatic activity is regulated by directly or indirectly binding extracellular &quot;signal&quot; molecules.
(ROOT (S (NP (JJ Enzymatic) (NNS cascades)) (VP (VBP help) (VP (VB amplify) (NP (NP (DT the) (NNS effects)) (PP (IN of) (NP (NN extracellular) (NNS signals)))))) (. .)))