Table 1.

Clinical characteristics of monozygotic twin pairs.

Twin pair no	Gender	Age	Duration of MS (years)	Type of MS	EDSS	Immunomodulatory treatment
1	F	54	11	SP	1.5	n.t.
	F	54	Healthy/0	Healthy
2	F	48	1	RR	4.0	IFN-β-1a
	F	48	Healthy/0	Healthy
3	F	55	9	SP	7.0	IFN-β-1b
	F	55	Healthy/0	Healthy
4	M	53	23	SP	6.5	n.t.
	M	53	Healthy/0	Healthy
5	F	33	5	RR	4.0	IFN-β-1a
	F	33	Healthy/0	Healthy
6	F	54	3	RR	4.5	IFN-β-1b
	F	54	Healthy/0	Healthy
7	M	66	11	SP	6.5	n.t.
	M	66	Healthy/0	Healthy
8	M	46	22	SP	6.5	n.t.
	M	46	Healthy/0	Healthy

F female; M male; n.t. no treatment; EDSS Expanded Disability Status Scale; IFN-β beta-interferon