Table 1.

Morphometric analysis of myelinated fiber ultrastructure in optic nerves from P120 Nkx6-2 null mice

	-/-			+/+ and +/-
Morphological feature	%	Number of axons	%	Number of axons
Paranodesa	2.4	990	2.2	190
Internodal loopsa	11	990	0.5	190
Unmyelinated axonsb	27	1064	1	903
Internodal loopsb	13	1064	0.7	903

^a Longitudinal sections of optic nerve.

^b Transverse sections of optic nerve.