( ( ( Development ( of ( ( the spleen ) ( as ( a ( red ( blood ( cell reservoir ) ) ) ) ) ) ) ) ( in lambs ) ) . )
(ROOT (NP (NP (NNP Development)) (PP (IN of) (NP (NP (DT the) (NN spleen)) (PP (IN as) (NP (DT a) (JJ red) (NN blood) (NN cell) (NN reservoir))))) (PP (IN in) (NP (NNS lambs))) (. .)))
Development of the spleen as a red blood cell reservoir in lambs.
(ROOT (S (NP (NP (DT The) (JJ main) (NN function)) (PP (IN of) (NP (DT the) (NN spleen)))) (VP (VBZ is) (S (VP (TO to) (VP (VP (VB filter) (NP (DT the) (NN blood))) (CC and) (VP (VB remove) (NP (JJ unwanted) (JJ red) (NN blood) (NNS cells))))))) (. .)))
The main function of the spleen is to filter the blood and remove unwanted red blood cells.