( ( ( ( ( Special organs ) , ) ( called amebocytes ) ) , ) ( ( ( secrete ( calcium ( carbonate spicules ) ) ) ( in ( ( the coenenchyme ) ( which ( ( give ( ( rigidity and ) support ) ) ( to ( the colony ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Special) (NNS organs)) (, ,) (VP (VBN called) (NP (NNS amebocytes))) (, ,)) (VP (VBP secrete) (NP (NN calcium) (NN carbonate) (NNS spicules)) (PP (IN in) (NP (NP (DT the) (NN coenenchyme)) (SBAR (WHNP (WDT which)) (S (VP (VBP give) (NP (NN rigidity) (CC and) (NN support)) (PP (TO to) (NP (DT the) (NN colony))))))))) (. .)))
Special organs, called amebocytes, secrete calcium carbonate spicules in the coenenchyme which give rigidity and support to the colony.
(ROOT (S (NP (NP (DT The) (JJ sharp) (NNS projections)) (SBAR (IN that) (S (NP (JJ specialized) (NNS cells)) (VP (VBP grow))))) (VP (VBP are) (VP (VBN called) (NP (NNS spicules)))) (. .)))