Table 1.

Distribution of MITF and Mart-1 positive cells by EGA^*

EGA	Intradermal (per HPF)	Epidermis, suprabasal (per HPF)	Epidermis, basal (per HPF)	Hair peg	ORS	Hair matrix	Bulge area
6-8 weeks (n = 2)	15.2/17.2†	N/A	<0.1/<0.1	N/A	N/A	N/A	N/A
12-13 weeks (n = 3)	<0.1/<0.1	3.4 ± 1.28/4.6 ± 1.5	1.2 ± 0.8/0.9 ± 0.3	N/A	N/A	N/A	N/A
15-17 weeks (n = 4)	<0.05/<0.05	1.0 ± 1.0/1.3 ± 1.2	6.6 ± 1.1/7.5 ± 2.0	2.5 ± 0.7/ 2.8 ± 0.9	N/A	N/A	N/A
18-24 weeks (n = 19)	<0.2/<0.2	<0.1/<0.1	5.5 ± 1.7/6.4 ± 1.5	N/A	4.6 ± 1.42/ 4.6 ± 1.1	4.2 ± 1.68/ 4.6 ± 1.65	1.7 ± 0.73/ 1.6 ±1.0

EGA, estimated gestational age; ORS, outer root sheath; N/A, not applicable.

^*Mean number of MITF-positive cells/Mart-1 positive cells per HPF or per hair follicle structure ± standard deviation.

^†Standard deviation not calculable (n = 2).