( ( Capillary Capillary ) ( ( is ( the ( smallest ( blood vessel ) ) ) ) . ) )
(ROOT (S (NP (NNP Capillary) (NNP Capillary)) (VP (VBZ is) (NP (DT the) (JJS smallest) (NN blood) (NN vessel))) (. .)))
Capillary Capillary is the smallest blood vessel.
(ROOT (S (NP (NNP Oxygen)) (VP (VBZ is) (VP (VBN transferred) (PP (IN through) (NP (NNS capillaries))))) (. .)))