( ( lack ( red ( blood cells ) ) ) . )
(ROOT (NP (NP (NN lack)) (NP (JJ red) (NN blood) (NNS cells)) (. .)))
lack red blood cells.
(ROOT (S (NP (NNP Red) (NN blood) (NNS cells)) (VP (VBP are) (NP (DT the) (RBS most) (JJ numerous) (NN blood) (NNS cells))) (. .)))