( Capillaries ( ( ( are ( ( ( small , ) and ) smaller ) ) ( than ( any ( other ( blood vessels ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Capillaries)) (VP (VBP are) (ADJP (ADJP (JJ small)) (, ,) (CC and) (ADJP (JJR smaller))) (PP (IN than) (NP (DT any) (JJ other) (NN blood) (NNS vessels)))) (. .)))
Capillaries are small, and smaller than any other 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))))) (. .)))