( ( ( ( the ( spicule neurons ) ) and ) ( sheath cells ) ) ( , ( ( although ( important ( for ( spicule function ) ) ) ) ( , ( ( are ( dispensable ( for ( spicule morphology ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (DT the) (JJ spicule) (NNS neurons)) (CC and) (NP (NN sheath) (NNS cells))) (, ,) (SBAR (IN although) (S (ADJP (JJ important)) (PP (IN for) (NP (JJ spicule) (NN function))))) (, ,) (VP (VBP are) (ADJP (JJ dispensable) (PP (IN for) (NP (JJ spicule) (NN morphology))))) (. .)))
the spicule neurons and sheath cells, although important for spicule function, are dispensable for spicule morphology.
(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)))) (. .)))