( ( ( Paralytic involvement ) ( in ( all ( four limbs ) ) ) ) . )
(ROOT (NP (NP (JJ Paralytic) (NN involvement)) (PP (IN in) (NP (DT all) (CD four) (NNS limbs))) (. .)))
Paralytic involvement in all four limbs.
(ROOT (S (NP (DT All) (NNS mammals)) (VP (VBP have) (NP (CD four) (NNS limbs))) (. .)))