A mutant is a copy of the system in which a change has been done that, in most cases, will lead to a behaviour different than expected.
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	2:det	Discourse=context-background:21->16:3|Entity=(34-abstract-new-cf2-2-coref
2	mutant	mutant	NOUN	NN	Number=Sing	5	nsubj	5:nsubj	Entity=34)
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	5:cop	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	5:det	Entity=(34-abstract-giv:act-cf2-2-pred
5	copy	copy	NOUN	NN	Number=Sing	0	root	0:root|15:obl:in	_
6	of	of	ADP	IN	_	8	case	8:case	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	Entity=(33-abstract-giv:act-cf1*-2-coref
8	system	system	NOUN	NN	Number=Sing	5	nmod	5:nmod:of	Entity=33)
9	in	in	ADP	IN	_	10	case	10:case	Discourse=elaboration-attribute:22->21:0
10	which	which	PRON	WDT	PronType=Rel	15	obl	5:ref	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	12:det	Entity=(35-event-new-cf5-5-sgl
12	change	change	NOUN	NN	Number=Sing	15	nsubj:pass	15:nsubj:pass|23:nsubj	_
13	has	have	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	aux	15:aux	_
14	been	be	AUX	VBN	Tense=Past|VerbForm=Part	15	aux:pass	15:aux:pass	_
15	done	do	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	acl:relcl	5:acl:relcl	_
16	that	that	PRON	WDT	PronType=Rel	23	nsubj	12:ref	Discourse=elaboration-attribute:23->22:0|SpaceAfter=No
17	,	,	PUNCT	,	_	16	punct	16:punct	_
18	in	in	ADP	IN	_	20	case	20:case	_
19	most	most	ADJ	JJS	Degree=Sup	20	amod	20:amod	Entity=(36-event-new-cf3-2-sgl
20	cases	case	NOUN	NNS	Number=Plur	23	obl	23:obl:in	Entity=36)|SpaceAfter=No
21	,	,	PUNCT	,	_	20	punct	20:punct	_
22	will	will	AUX	MD	VerbForm=Fin	23	aux	23:aux	_
23	lead	lead	VERB	VB	VerbForm=Inf	12	acl:relcl	12:acl:relcl	_
24	to	to	ADP	IN	_	26	case	26:case	_
25	a	a	DET	DT	Definite=Ind|PronType=Art	26	det	26:det	Entity=(37-event-new-cf4-2-sgl
26	behaviour	behaviour	NOUN	NN	Number=Sing	23	obl	23:obl:to	_
27	different	different	ADJ	JJ	Degree=Pos	26	amod	26:amod	_
28	than	than	ADP	IN	_	29	case	29:case	Discourse=adversative-antithesis:24->23:0
29	expected	expect	VERB	VBN	Tense=Past|VerbForm=Part	27	obl	27:obl:than	Entity=37)35)34)|SpaceAfter=No
30	.	.	PUNCT	.	_	5	punct	5:punct	_
