Table 2.

Dimensions of Normal Protoplasmic and Fibrous Astrocytes as Measured by Different Labeling Techniques

	Mouse		Human	Chimpanzee
	Particle-mediated dye labeling	GFAP labeling	GFAP labeling	GFAP labeling
Protoplasmic (cortical)
Diameter, μm	57.7 ± 3.8	56.0 ± 2.0	142.6 ± 5.8	81.7 ± 1.9
Longest process, μm	39.8 ± 2.3	37.2 ± 1.2	97.9 ± 5.2	—
Thickest process, μm	2.6 ± 0.2	2.2 ± 0.1	2.9 ± 0.18	—
No. of GFAP+ processes	—	3.75 ± 0.11	37.5 ± 5.17	—
Fibrous (corpus callosum)
Diameter, mm	—	85.6 ± 2.7	183.2 ± 6.1	—

Data derived from Oberheim and others (2008, 2009).