It has been proposed that the relative mass of the CFL can be used as a proxy to estimate the relative importance of femoral retraction during locomotion in extinct bipedal dinosaurs [8].
1	It	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	expl	4:expl	Discourse=context-background:21->25:2|Entity=(46-abstract-new-cf2-1-cata)
2	has	have	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
3	been	be	AUX	VBN	Tense=Past|VerbForm=Part	4	aux:pass	4:aux:pass	_
4	proposed	propose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
5	that	that	SCONJ	IN	_	14	mark	14:mark	_
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	Entity=(46-abstract-acc:com-cf2-9-coref(47-abstract-new-cf3-3-coref
7	relative	relative	ADJ	JJ	Degree=Pos	8	amod	8:amod	_
8	mass	mass	NOUN	NN	Number=Sing	14	nsubj:pass	14:nsubj:pass	_
9	of	of	ADP	IN	_	11	case	11:case	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	11:det	Entity=(48-object-new-cf5-2-coref
11	CFL	CFL	NOUN	NN	Number=Sing	8	nmod	8:nmod:of	Entity=48)47)
12	can	can	AUX	MD	VerbForm=Fin	14	aux	14:aux	_
13	be	be	AUX	VB	VerbForm=Inf	14	aux:pass	14:aux:pass	_
14	used	use	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	csubj:pass	4:csubj:pass	_
15	as	as	ADP	IN	_	17	case	17:case	_
16	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	17:det	_
17	proxy	proxy	NOUN	NN	Number=Sing	14	obl	14:obl:as	_
18	to	to	PART	TO	_	19	mark	19:mark	Discourse=purpose-goal:22->21:0
19	estimate	estimate	VERB	VB	VerbForm=Inf	14	advcl	14:advcl:to	_
20	the	the	DET	DT	Definite=Def|PronType=Art	22	det	22:det	Entity=(49-abstract-new-cf4-3-sgl
21	relative	relative	ADJ	JJ	Degree=Pos	22	amod	22:amod	_
22	importance	importance	NOUN	NN	Number=Sing	19	obj	19:obj	_
23	of	of	ADP	IN	_	25	case	25:case	_
24	femoral	femoral	ADJ	JJ	Degree=Pos	25	amod	25:amod	Entity=(50-event-new-cf6-2-sgl
25	retraction	retraction	NOUN	NN	Number=Sing	22	nmod	22:nmod:of	_
26	during	during	ADP	IN	_	27	case	27:case	_
27	locomotion	locomotion	NOUN	NN	Number=Sing	25	nmod	25:nmod:during	Entity=(30-event-giv:inact-cf1-1-coref
28	in	in	ADP	IN	_	31	case	31:case	_
29	extinct	extinct	ADJ	JJ	Degree=Pos	31	amod	31:amod	Entity=(51-animal-new-cf7-3-sgl
30	bipedal	bipedal	ADJ	JJ	Degree=Pos	31	amod	31:amod	_
31	dinosaurs	dinosaur	NOUN	NNS	Number=Plur	27	nmod	27:nmod:in	Entity=51)30)50)49)46)
32	[	[	PUNCT	-LRB-	_	33	punct	33:punct	Discourse=explanation-evidence:23->21:1|SpaceAfter=No|XML=<ref>
33	8	8	NUM	CD	NumForm=Digit|NumType=Card	4	dep	4:dep	Entity=(52-abstract-new-cf8-1-coref)|SpaceAfter=No
34	]	]	PUNCT	-RRB-	_	33	punct	33:punct	SpaceAfter=No|XML=</ref>
35	.	.	PUNCT	.	_	4	punct	4:punct	_
