( ( This paper ) ( ( ( ( transferred ( ( two embryos ) each ) ) ( to ( ( ( ( ( one group ) ( of ( 28 ( healthy women ) ) ) ) , ) and ) ( ( four embryos ) each ) ) ) ) ( to ( another ( such group ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN paper)) (VP (VBD transferred) (NP (NP (CD two) (NNS embryos)) (NP (DT each))) (PP (TO to) (NP (NP (NP (CD one) (NN group)) (PP (IN of) (NP (CD 28) (JJ healthy) (NNS women)))) (, ,) (CC and) (NP (NP (CD four) (NNS embryos)) (NP (DT each))))) (PP (TO to) (NP (DT another) (JJ such) (NN group)))) (. .)))
This paper transferred two embryos each to one group of 28 healthy women, and four embryos each to another such group.
(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.