Table 1.

Detection of MBP, CNP, and/or glycolipids expressing cells in the human fetal spinal cord at different postconceptional ages

Age (dpc)	No. of specimens analyzed	Ventral half			Dorsal half
		Adjacent to VZ	Either side of the floor plate	Lateral forming white matter*	Dorsal forming white matter*
45 –52	6	+	−	−	−
53 –54	6	+	+	−	−
57	8	+	+	+	−
74 –83	9	+†	+	+	+

Presence (+) or absence (−) of cells stained by MBP or CNP, O4, or Rmab antibodies in the spinal cord sections.

^*O4⁺ cells were also present in gray matter in this region, although in smaller numbers than in white matter.

^†At these ages oligodendrocyte precursors were close to, but not juxtaposed to, the VZ.