( ( Although ( ( ( not all ) ( of ( these traits ) ) ) ( are ( retained ( in ( the ( adult stage ) ) ) ) ) ) ) ( , ( ( in ( their ( larval stage ) ) ) ( they ( ( look ( very ( much ( like ( ( ( other ( developing ( chordate embryos ) ) ) , ) ( including humans ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (NP (RB not) (DT all)) (PP (IN of) (NP (DT these) (NNS traits)))) (VP (VBP are) (VP (VBN retained) (PP (IN in) (NP (DT the) (JJ adult) (NN stage))))))) (, ,) (PP (IN in) (NP (PRP$ their) (JJ larval) (NN stage))) (NP (PRP they)) (VP (VBP look) (ADJP (RB very) (JJ much) (PP (IN like) (NP (NP (JJ other) (VBG developing) (NN chordate) (NNS embryos)) (, ,) (PP (VBG including) (NP (NNS humans))))))) (. .)))
Although not all of these traits are retained in the adult stage, in their larval stage they look very much like other developing chordate embryos, including humans.
(ROOT (S (NP (JJ Adult) (NNS humans)) (VP (VBP lack) (NP (NP (DT some)) (PP (IN of) (NP (NP (DT the) (VBG defining) (NNS traits)) (PP (IN of) (NP (NNS chordates))))))) (. .)))