Randy, that is typical of the "marker" that I look for in my pos. hets. I have 2 females that I'm trying this year. Every single 100% het I have produced have the marker and half of the 50% pos. hets have had it. I think what people don't realise is, that some normals do have a striped belly, but in a side by side comparison, it's apples and oranges. Pete Kahl wouldn't have sold all of his 100% hets, and kept all his 66% pos. hets if something wasn't going on. He is the one that discovered it. And I also agree, not all 100% hets will have it.....and it's most useful when buying pos. hets.
Like Justin said, it's not just about the stripes on the belly. See that yellow smudging on Randy's animal? I would bet that girl is a 100% het. Good luck with her.
Brandon Osborne