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