However, substantial differences in hindlimb morphology between these groups make difficult to assess the validity of inferences obtained from such studies.
1	However	however	ADV	RB	_	11	advmod	11:advmod	Discourse=adversative-antithesis:110->108:1|SpaceAfter=No
2	,	,	PUNCT	,	_	1	punct	1:punct	_
3	substantial	substantial	ADJ	JJ	Degree=Pos	4	amod	4:amod	Entity=(174-abstract-new-cf2-2-sgl
4	differences	difference	NOUN	NNS	Number=Plur	11	nsubj	11:nsubj|12:nsubj:xsubj|14:nsubj:xsubj	_
5	in	in	ADP	IN	_	7	case	7:case	_
6	hindlimb	hindlimb	NOUN	NN	Number=Sing	7	compound	7:compound	Entity=(175-abstract-new-cf4-2-sgl(176-object-new-cf7-1-sgl)
7	morphology	morphology	NOUN	NN	Number=Sing	4	nmod	4:nmod:in	Entity=175)
8	between	between	ADP	IN	_	10	case	10:case	_
9	these	this	DET	DT	Number=Plur|PronType=Dem	10	det	10:det	Entity=(177-animal-acc:aggr-cf1-2-sgl|SplitAnte=170<177,173<177
10	groups	group	NOUN	NNS	Number=Plur	4	nmod	4:nmod:between	Entity=177)174)
11	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|Typo=Yes|VerbForm=Fin	0	root	0:root	CorrectForm=make it|XML=<sic ana:::"make it"></sic>
12	difficult	difficult	ADJ	JJ	Degree=Pos	11	xcomp	11:xcomp	_
13	to	to	PART	TO	_	14	mark	14:mark	_
14	assess	assess	VERB	VB	VerbForm=Inf	12	xcomp	12:xcomp	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	16:det	Entity=(178-abstract-new-cf3-2-sgl
16	validity	validity	NOUN	NN	Number=Sing	14	obj	14:obj	_
17	of	of	ADP	IN	_	18	case	18:case	_
18	inferences	inference	NOUN	NNS	Number=Plur	16	nmod	16:nmod:of	Entity=(179-abstract-new-cf5-1-sgl
19	obtained	obtain	VERB	VBN	Tense=Past|VerbForm=Part	18	acl	18:acl	Discourse=elaboration-attribute:111->110:0
20	from	from	ADP	IN	_	22	case	22:case	_
21	such	such	ADJ	JJ	Degree=Pos	22	amod	22:amod	Entity=(180-abstract-new-cf6-2-sgl
22	studies	study	NOUN	NNS	Number=Plur	19	obl	19:obl:from	Entity=180)179)178)|SpaceAfter=No
23	.	.	PUNCT	.	_	11	punct	11:punct	_
