( ( In ( the procedure ) ) ( , ( ( ( one or ) ( two cells ) ) ( ( can ( be ( removed ( from ( ( an ( IVF embryo ) ) ( ( ( ( ( at ( the 8 ) ) - ) ( to ( ( 16-cell stage ) ( for biopsy ) ) ) ) , ) ( without ( affecting ( ( subsequent development ) ( of ( the embryo ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (NN procedure))) (, ,) (NP (NP (CD one)) (CC or) (NP (CD two) (NNS cells))) (VP (MD can) (VP (VB be) (VP (VBN removed) (PP (IN from) (NP (NP (DT an) (NNP IVF) (NN embryo)) (PP (PP (IN at) (NP (DT the) (CD 8))) (: -) (PP (TO to) (NP (NP (JJ 16-cell) (NN stage)) (PP (IN for) (NP (NN biopsy))))) (, ,) (PP (IN without) (S (VP (VBG affecting) (NP (NP (JJ subsequent) (NN development)) (PP (IN of) (NP (DT the) (NN embryo))))))))))))) (. .)))
In the procedure, one or two cells can be removed from an IVF embryo at the 8- to 16-cell stage for biopsy, without affecting subsequent development of the embryo.
(ROOT (S (NP (NP (NNS Invertebrates)) (-LRB- -LRB-) (CC and) (NP (JJR higher) (NNS animals)) (-RRB- -RRB-)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN placed) (PP (IN in) (NP (NP (CD one)) (PP (IN of) (NP (CD two) (NNS groups))))) (PP (VBN based) (PP (IN on) (SBAR (WHADVP (WRB how)) (S (NP (PRP they)) (VP (VBP develop) (PP (IN as) (NP (NNS embryos))))))))))) (. .)))
Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as embryos.