( ( ( ( Academical networks ) and ) ( commercial ones ) ) ( ( ( ( ( have ( not ( a ( common backbone ) ) ) ) , ) or ) ( are ( in ( ( the process ) ( of ( doing so ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Academical) (NNS networks)) (CC and) (NP (JJ commercial) (NNS ones))) (VP (VP (VBP have) (NP (RB not) (DT a) (JJ common) (NN backbone))) (, ,) (CC or) (VP (VBP are) (PP (IN in) (NP (NP (DT the) (NN process)) (PP (IN of) (S (VP (VBG doing) (ADVP (RB so))))))))) (. .)))
Academical networks and commercial ones have not a common backbone, or are in the process of doing so.
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (JJ main) (NNS features)) (SBAR (S (NP (DT all) (NNS vetebrates)) (VP (VBP have) (VP (PP (IN in) (NP (JJ common)))))))))) (VP (VBZ is) (NP (DT a) (NN backbone))) (. .)))