Table 1.

Different types of intermediate filaments and their movements

Cytoplasmic intermediate filament type	Protein studied	Cell type	Structural form observed	Published results	n=	Time moving (%)	Time pausing (%)	Antero movements (%)	Retro movements (%)	Average antero motility (mm/sec)	Range antero (μm/sec)	Average retro motility (μm/sec)	Range retro (μm/sec)
Type I	Keratin 13	AK13-1	Particles (dots)	Windoffer and Leube, 1999					Mostly Retro		0.002-0.008		0.002-0.008
	Keratin 18	PtK2	Squiggles	Yoon et al., 2001	37	18^*	82	16	84	0.004±0.03	0.002-0.01	0.004±0.03	0.002-0.01
Type II	Keratin 5	NEB-1	Particles	Liovic et al., 2003	16						>0.1		>0.1
	Keratin 8	PtK2	Filaments	Yoon et al., 2001	14					0.001±3.33E-05		0.001±3.33E-05
Type III	Vimentin	BHK-21	Particles	Helfand et al., 2003	53	45	55	66	34	0.39±0.24	0.08-1.65	0.43±0.26	0.08-1.40
			Squiggles	Yoon et al., 1998	32			97	3	0.06±0.03	0.02-0.19	0.06±0.03	0.02-0.19
			Filaments	Yoon et al., 1998	23					0.004±0.002		0.004±0.002
	Vimentin	PtK2	Squiggles	Yoon et al., 2001	32			70	30	0.06±0.04	0.006-0.15	0.06±0.04	0.006-0.15
			Filaments	Yoon et al., 2001	29					0.15±0.11		0.15±0.11
	Vimentin	3T3	Squiggles	Martys et al., 1999						0.25		0.25
	Peripherin	PC12	Particles	Helfand et al., 2003	77	75	25	65	35	0.33±0.24	0.08-1.45	0.30±0.20	0.08-1.54
			Squiggles	Helfand et al., 2003	50	70	30	62	38	0.31±0.29	0.08-1.21	0.30±0.28	0.08-1.00
Type IV	NF-M	Rat sympathetic neurons	Short filaments	Wang et al., 2000	69	27	73	83	17	0.38	0.02-1.21	0.49	0.15-1.82
	NF-M	Rat sympathetic neurons	Short filaments	Wang et al., 2001	69	33	67	69	31	0.56	0.15-1.26	0.62	0.17-1.35
	NF-M	Rat sympathetic neurons	Particles	Wang et al., 2001	17	56	44	22	88	0.08	0.06-0.10	0.32	0.13-0.60
	NF-M	NB2a/d1	Particles	Yabe et al., 1999				>80%	<20%	0.025±0.005
	NF-H	Rat sympathetic neurons	Short filaments	Roy et al., 2000	73	20	80	71	29	0.67	0.14-1.7	0.57	0.11-1.4
	NF-L, NF-M, NF-H	Purified bovine spinal cordrrrr	Short filaments	Shah et al., 2000						0.27	∼0.1-0.85	0.29	∼0.1-1
	NF-L, NF-M, NF-H	Axoplasm from Loligo pealei	Particles	Prahlad et al., 2000	10						0.5-1.0		0.5-1.0