( ( ( A number ) ( of ( small ( blood ( ( vessels and ) capillaries ) ) ) ) ) ( also ( ( contain ( positive-staining material ) ) . ) ) )
(ROOT (S (NP (NP (DT A) (NN number)) (PP (IN of) (NP (JJ small) (NN blood) (NNS vessels) (CC and) (NNS capillaries)))) (ADVP (RB also)) (VP (VBP contain) (NP (JJ positive-staining) (NN material))) (. .)))
A number of small blood vessels and capillaries also contain positive-staining material.
(ROOT (S (NP (NNS Capillaries)) (VP (VBP are) (NP (NP (DT the) (JJS smallest) (NN type)) (PP (IN of) (NP (NN blood) (NNS vessels))))) (. .)))