When people are searching using the virtual microscope, they will be looking not for the particles, but for the tracks that the particles make, which are much larger — several microns in diameter.
1	When	when	ADV	WRB	PronType=Int	4	advmod	4:advmod	Discourse=context-circumstance:128->130:2
2	people	person	NOUN	NNS	Number=Plur	4	nsubj	4:nsubj	Entity=(99-person-giv:inact-cf1-1-coref)
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
4	searching	search	VERB	VBG	Tense=Pres|VerbForm=Part	13	advcl	13:advcl:when	_
5	using	use	VERB	VBG	VerbForm=Ger	4	advcl	4:advcl	Discourse=mode-means:129->128:0
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	Entity=(94-abstract-giv:inact-cf3-3-coref
7	virtual	virtual	ADJ	JJ	Degree=Pos	8	amod	8:amod	_
8	microscope	microscope	NOUN	NN	Number=Sing	5	obj	5:obj	Entity=94)|SpaceAfter=No
9	,	,	PUNCT	,	_	4	punct	4:punct	_
10	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	13	nsubj	13:nsubj	Discourse=elaboration-additional:130->126:2|Entity=(99-person-giv:act-cf1-1-ana)
11	will	will	AUX	MD	VerbForm=Fin	13	aux	13:aux	_
12	be	be	AUX	VB	VerbForm=Inf	13	aux	13:aux	_
13	looking	look	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	0:root	_
14	not	not	PART	RB	Polarity=Neg	17	advmod	17:advmod	_
15	for	for	ADP	IN	_	17	case	17:case	_
16	the	the	DET	DT	Definite=Def|PronType=Art	17	det	17:det	Entity=(11-object-giv:inact-cf2-2-coref
17	particles	particle	NOUN	NNS	Number=Plur	13	obl	13:obl:for	Entity=11)|SpaceAfter=No
18	,	,	PUNCT	,	_	22	punct	22:punct	_
19	but	but	CCONJ	CC	_	22	cc	22:cc	_
20	for	for	ADP	IN	_	22	case	22:case	_
21	the	the	DET	DT	Definite=Def|PronType=Art	22	det	22:det	Entity=(100-abstract-giv:inact-cf4-2-coref
22	tracks	track	NOUN	NNS	Number=Plur	17	conj	13:obl:for|17:conj:but|26:obj|31:nsubj	_
23	that	that	PRON	WDT	PronType=Rel	26	obj	22:ref	Discourse=elaboration-attribute:131->130:0
24	the	the	DET	DT	Definite=Def|PronType=Art	25	det	25:det	Entity=(11-object-giv:act-cf2-2-coref
25	particles	particle	NOUN	NNS	Number=Plur	26	nsubj	26:nsubj	Entity=11)
26	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	22	acl:relcl	22:acl:relcl	SpaceAfter=No
27	,	,	PUNCT	,	_	31	punct	31:punct	_
28	which	which	PRON	WDT	PronType=Rel	31	nsubj	22:ref	Discourse=elaboration-attribute:132->130:1
29	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	31	cop	31:cop	_
30	much	much	ADV	RB	Degree=Pos	31	advmod	31:advmod	_
31	larger	large	ADJ	JJR	Degree=Cmp	22	acl:relcl	22:acl:relcl	Entity=100)
32	—	—	PUNCT	:	_	34	punct	34:punct	Discourse=elaboration-additional:133->132:0
33	several	several	ADJ	JJ	Degree=Pos	34	amod	34:amod	Entity=(132-abstract-new-cf5-2-sgl
34	microns	micron	NOUN	NNS	Number=Plur	31	appos	31:appos	_
35	in	in	ADP	IN	_	36	case	36:case	_
36	diameter	diameter	NOUN	NN	Number=Sing	34	nmod	34:nmod:in	Entity=(133-abstract-new-cf6-1-sgl)132)|SpaceAfter=No
37	.	.	PUNCT	.	_	13	punct	13:punct	_
