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