( ( 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 (NNS Capillaries)) (VP (VBP are) (NP (NP (DT the) (JJS smallest) (NN type)) (PP (IN of) (NP (NN blood) (NNS vessels))))) (. .)))