A key question is how they acquired the anthrax strain first isolated by the Texas Veterinary Medical Diagnostic Lab in 1980.
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	3:det	_
2	key	key	ADJ	JJ	Degree=Pos	3	amod	3:amod	_
3	question	question	NOUN	NN	Number=Sing	7	nsubj:outer	7:nsubj:outer	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	7:cop	_
5	how	how	ADV	WRB	PronType=Int	7	advmod	7:advmod	_
6	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	7	nsubj	7:nsubj	_
7	acquired	acquire	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	0	root	0:root	_
8	the	the	DET	DT	Definite=Def|PronType=Art	10	det	10:det	_
9	anthrax	anthrax	NOUN	NN	Number=Sing	10	compound	10:compound	_
10	strain	strain	NOUN	NN	Number=Sing	7	obj	7:obj	_
11	first	first	ADV	RB	NumType=Ord	12	advmod	12:advmod	_
12	isolated	isolate	VERB	VBN	Tense=Past|VerbForm=Part	10	acl	10:acl	_
13	by	by	ADP	IN	_	19	case	19:case	_
14	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
15	Texas	Texas	PROPN	NNP	Number=Sing	19	compound	19:compound	_
16	Veterinary	Veterinary	ADJ	NNP	Degree=Pos	19	amod	19:amod	_
17	Medical	Medical	ADJ	NNP	Degree=Pos	19	amod	19:amod	_
18	Diagnostic	Diagnostic	ADJ	NNP	Degree=Pos	19	amod	19:amod	_
19	Lab	Lab	PROPN	NNP	Number=Sing	12	obl	12:obl:by	_
20	in	in	ADP	IN	_	21	case	21:case	_
21	1980	1980	NUM	CD	NumForm=Digit|NumType=Card	12	obl	12:obl:in	SpaceAfter=No
22	.	.	PUNCT	.	_	7	punct	7:punct	_
