I'm not sure anyone has bred the homozygous versions of the different strains together. At least with the VPI to Snake Keeper test I heard about there was a het on at least one side of the test. Not sure what the VPI to Jolliff test was or if any of the other possible line crosses have been done at all.

I think it would be worth a try to see if the double homozygous axanthic would be better. Maybe there is a different source to the yellow that creeps in with age to different lines and two lines would compliment each other. However, the hard part might be identifying that 1 in 16 double homozygous even if someone was willing to breed the two original homozygous axanthics from the different lines together to produce for sure double hets to kick the project off. If the double homozygous wasn't stunningly different at hatching you might have to raise all of the axanthic babies up and do lots of breeding experiments to confirm that you probably have a double homozygous.

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