( ( Look ( for ( ( these cells ) ( ( ( ( on ( ( the ends ) ( of ( spicules ( of ( the trabeculae ) ) ) ) ) ) , ) or ) ( in pockets ) ) ) ) ) ( they ( ( 've ( ( created ( for themselves ) ) ( on ( ( the surface ) ( of ( a spicule ) ) ) ) ) ) . ) ) )
(ROOT (S (S (VP (VB Look) (PP (IN for) (NP (NP (DT these) (NNS cells)) (PP (PP (IN on) (NP (NP (DT the) (NNS ends)) (PP (IN of) (NP (NP (NNS spicules)) (PP (IN of) (NP (DT the) (NN trabeculae))))))) (, ,) (CC or) (PP (IN in) (NP (NNS pockets)))))))) (NP (PRP they)) (VP (VBP 've) (VP (VBN created) (PP (IN for) (NP (PRP themselves))) (PP (IN on) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT a) (NN spicule))))))) (. .)))
Look for these cells on the ends of spicules of the trabeculae, or in pockets they've created for themselves on the surface of a spicule.
(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)))) (. .)))