( ( Capillaries ( The ( tiniest ( blood vessels ) ) ) ) . )
(ROOT (NP (NP (NNS Capillaries)) (NP (DT The) (JJS tiniest) (NN blood) (NNS vessels)) (. .)))
Capillaries The tiniest 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))))) (. .)))