0	10	Attenuated	attenuate	VBN
11	19	function	function	NN
20	22	of	of	IN
23	24	a	a	DT
25	32	variant	variant	JJ
33	37	form	form	NN
38	40	of	of	IN
41	44	the	the	DT
45	61	helix-loop-helix	helix-loop-helix	JJ
62	69	protein	protein	NN
69	70	,	,	,
71	75	Id-3	Id-3	NNP
75	76	,	,	,
77	86	generated	generate	VBN
87	89	by	by	IN
90	92	an	an	DT
93	104	alternative	alternative	JJ
105	113	splicing	splicing	NN
114	123	mechanism	mechanism	NN
123	124	.	.	.

126	129	The	the	DT
130	132	Id	id	NN
133	139	family	family	NN
140	142	of	of	IN
143	159	helix-loop-helix	helix-loop-helix	JJ
160	168	proteins	protein	NNS
169	177	function	function	VBP
178	180	as	as	IN
181	189	negative	negative	JJ
190	200	regulators	regulator	NNS
201	203	of	of	IN
204	207	DNA	DNA	NNP
208	215	binding	binding	NN
215	216	,	,	,
217	222	basic	basic	JJ
223	239	helix-loop-helix	helix-loop-helix	JJ
240	248	proteins	protein	NNS
249	251	in	in	IN
252	255	the	the	DT
256	266	regulation	regulation	NN
267	269	of	of	IN
270	274	cell	cell	NN
275	281	growth	growth	NN
282	285	and	and	CC
286	301	differentiation	differentiation	NN
301	302	.	.	.

303	305	We	we	PRP
306	312	report	report	VBP
313	317	here	here	RB
318	320	on	on	IN
321	324	the	the	DT
325	339	identification	identification	NN
340	342	of	of	IN
343	344	a	a	DT
345	347	17	17	CD
348	351	kDa	kda	NN
352	359	variant	variant	NN
360	362	of	of	IN
363	366	the	the	DT
367	369	14	14	CD
370	373	kDa	kda	NN
374	378	Id-3	id-3	NN
379	386	protein	protein	NN
387	393	termed	term	VBN
394	399	Id-3L	Id-3L	NNP
400	401	(	(	(
401	405	long	long	JJ
406	413	version	version	NN
413	414	)	)	)
415	420	which	which	WDT
421	430	possesses	possess	VBZ
431	432	a	a	DT
433	439	unique	unique	JJ
440	442	60	60	CD
443	448	amino	amino	NN
449	453	acid	acid	NN
454	470	carboxy-terminus	carboxy-terminus	NN
471	480	generated	generate	VBN
481	483	by	by	IN
484	488	read	read	VBN
489	496	through	through	IN
497	499	of	of	IN
500	501	a	a	DT
502	503	‘	`	``
503	509	coding	cod	VBG
510	516	intron	intron	NN
516	517	’	'	''
518	521	and	and	CC
522	533	alternative	alternative	JJ
534	542	splicing	splicing	NN
542	543	.	.	.

544	552	Northern	Northern	NNP
553	561	analysis	analysis	NN
562	570	revealed	reveal	VBD
571	581	expression	expression	NN
582	584	of	of	IN
585	586	a	a	DT
587	592	minor	minor	JJ
593	596	1.1	1.1	CD
597	599	kb	kb	NN
600	605	Id-3L	Id-3L	NNP
606	616	transcript	transcript	NN
617	625	together	together	RB
626	630	with	with	IN
631	634	the	the	DT
635	646	predominant	predominant	JJ
647	651	0.95	0.95	CD
652	654	kb	kb	NN
655	659	Id-3	id-3	NN
660	670	transcript	transcript	NN
671	673	in	in	IN
674	677	the	the	DT
678	686	majority	majority	NN
687	689	of	of	IN
690	695	adult	adult	JJ
696	701	human	human	JJ
702	709	tissues	tissue	NNS
710	718	analysed	analyse	VBN
718	719	.	.	.

720	723	The	the	DT
724	731	variant	variant	JJ
732	737	Id-3L	Id-3L	NNP
738	745	protein	protein	NN
746	748	is	be	VBZ
749	761	functionally	functionally	RB
762	777	distinguishable	distinguishable	JJ
778	782	from	from	IN
783	795	conventional	conventional	JJ
796	800	Id-3	id-3	NN
801	806	since	since	IN
807	809	in	in	IN
810	812	in	in	FW
813	818	vitro	vitro	FW
819	822	DNA	dna	NN
823	831	mobility	mobility	NN
832	837	shift	shift	NN
838	844	assays	assay	NNS
844	845	,	,	,
846	848	it	it	PRP
849	852	was	be	VBD
853	860	greatly	greatly	RB
861	869	impaired	impaired	JJ
870	872	in	in	IN
873	876	its	its	PRP$
877	884	ability	ability	NN
885	887	to	to	TO
888	896	abrogate	abrogate	VB
897	904	binding	binding	NN
905	907	of	of	IN
908	911	the	the	DT
912	917	basic	basic	JJ
918	934	helix-loop-helix	helix-loop-helix	JJ
935	942	protein	protein	NN
942	943	,	,	,
944	947	E47	E47	NNP
947	948	,	,	,
949	951	to	to	TO
952	954	an	an	DT
955	956	E	e	NN
957	960	box	box	NN
961	972	recognition	recognition	NN
973	981	sequence	sequence	NN
981	982	.	.	.