If there's one person who knows the sugar gene its mike wilbanks. I've read from his site that if there's any doubt its a sugar it probably isn't a sugar. I myself have seen normal sugars look quit better then that. And for these reasons i'd say that's a low expression calico. That's just my take on it btw. I could be wrong. From what i understand and have read calico tends to be more high or low white where as sugar tends to be more consistent in the middle in the amount of white they show.
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