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