( ( ( Labeling ( single cells ) ) ( in ( ( older embryos ) 1 ) ) ) . )
(ROOT (S (VP (VBG Labeling) (NP (JJ single) (NNS cells)) (PP (IN in) (NP (NP (JJR older) (NNS embryos)) (NP (CD 1))))) (. .)))
Labeling single cells in older embryos 1.
(ROOT (S (NP (PRP We)) (ADVP (DT all)) (VP (VP (VBP start) (PP (IN as) (NP (DT a) (JJ single) (NN cell)))) (CC and) (VP (ADVP (RB soon)) (VBP grow) (PRT (RP into)) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN embryo)))) (. .)))