( ( ( ( ( The transplanting ) ( of ( ( tissues or ) organs ) ) ) ( from ( ( one type ) ( of animal ) ) ) ) ( into ( a ( ( ( human or ) other ) animal ) ) ) ) . )
(ROOT (NP (NP (DT The) (NN transplanting)) (PP (IN of) (NP (NNS tissues) (CC or) (NNS organs))) (PP (IN from) (NP (NP (CD one) (NN type)) (PP (IN of) (NP (NN animal))))) (PP (IN into) (NP (DT a) (UCP (NN human) (CC or) (JJ other)) (NN animal))) (. .)))
The transplanting of tissues or organs from one type of animal into a human or other animal.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN organ)) (VP (VBZ is) (NP (NP (DT a) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (QP (CD one) (CC or) (JJR more)) (NNS types)) (PP (IN of) (NP (NNS tissues))))))))))) (. .)))
A(n) organ is a structure that is composed of one or more types of tissues.