( ( ( A ( thin layer ) ) ( of ( clear cells ) ) ) ( ( ( found only ) ( in ( thick skin ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ thin) (NN layer)) (PP (IN of) (NP (JJ clear) (NNS cells)))) (VP (VBD found) (ADVP (RB only)) (PP (IN in) (NP (JJ thick) (NN skin)))) (. .)))
A thin layer of clear cells found only in thick skin.
(ROOT (S (NP (NP (DT The) (JJ thick) (NN skin)) (, ,) (VP (VBN found) (ADVP (RB only)) (PP (IN on) (NP (NP (NP (DT the) (NNS palms)) (PP (IN of) (NP (DT the) (NNS hands)))) (CC and) (NP (NP (DT the) (NNS soles)) (PP (IN of) (NP (DT the) (NNS feet))))))) (, ,)) (VP (VBZ has) (NP (DT an) (JJ extra) (NN layer))) (. .)))