the blackbelly ball python

how many of you have heard of this? its the key in producing yellow jackets (blackbelly pastels)... however i havnt seen many around. i have a questionable male with an insanely busy belly pattern. also he has some wierd side patterns. i will post pics when i can!

I've heard of black bellies but have never seen them or know much about them. I've seen several CH babies that have a black belly and hatched a het albino last year that had one.