( ( Describe ( ( the ( four types ) ) ( of ( cells ( in ( bone tissue ) ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (CD four) (NNS types)) (PP (IN of) (NP (NP (NNS cells)) (PP (IN in) (NP (NN bone) (NN tissue))))))) (. .)))
Describe the four types of cells in bone tissue.
(ROOT (S (NP (NP (CD Four) (NNS types)) (PP (IN of) (NP (NN tissue)))) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (NNS animals))))) (. .)))