( ( The phosphorylation ) ( ( is ( ( carried out ) ( by ( ( the ( JAK ( protein kinase ) ) ) ( which ( itself ( is ( activated ( by ( ( ( binding ( to ( ( a ( transmembrane receptor ) ) ( in ( the plasma ) ) ) ) ) membrane ) ( of cells ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN phosphorylation)) (VP (VBZ is) (VP (VBN carried) (PRT (RP out)) (PP (IN by) (NP (NP (DT the) (NNP JAK) (NN protein) (NN kinase)) (SBAR (WHNP (WDT which)) (S (NP (PRP itself)) (VP (VBZ is) (VP (VBN activated) (PP (IN by) (NP (NP (ADJP (JJ binding) (PP (TO to) (NP (NP (DT a) (JJ transmembrane) (NN receptor)) (PP (IN in) (NP (DT the) (NN plasma)))))) (NNS membrane)) (PP (IN of) (NP (NNS cells))))))))))))) (. .)))
The phosphorylation is carried out by the JAK protein kinase which itself is activated by binding to a transmembrane receptor in the plasma membrane of cells.
(ROOT (S (NP (JJ Transmembrane) (NNS proteins)) (VP (VBP span) (NP (DT the) (JJ entire) (NN plasma) (NN membrane))) (. .)))