( ( Red ( blood ( cell development ) ) ) ; )
(ROOT (NP (NP (NNP Red) (NN blood) (NN cell) (NN development)) (: ;)))
Red blood cell development;
(ROOT (S (NP (NNP Red) (NN blood) (NNS cells)) (VP (VBP are) (NP (DT the) (RBS most) (JJ numerous) (NN blood) (NNS cells))) (. .)))